Are speedometers different between models and years?

[Recovry4x4]

No problem. Call your GM dealer and use any CUCV VIN and ask for the part number for the door shell, Then use the VIN from a 1991 Suburban which has an R or V in the VIN and it is the same part number. Then try for a 92 and see what you get. Uh OH, not the same because it is a different body? How did that happen. By definition the C/K series trucks have and always been the 1973 to 1987 Chevy Trucks from K10 to K30 the 1500 to 3500 designation did not start until after 1987 except for suburban, Blazer and quad cab 1 ton trucks and the model was the number being " Chevy 1500" not K1500 because there is none. The GM Factory paper parts manual from the dealer is for 1973 to 1991 C/K series trucks. If you reference anywhere that is what they are. If I had more time I would love to scan (guessing)4500 pages of this book and post it because it is a great reference for the CUCV parts since most of the parts were from older design trucks but I just don't have the time. But do the parts search and you will see what I am talking about. and the 1988 body style was never marketed as a C/K series truck by GM and if it has I would love to see it. Just like the CUCV style trucks were never marketed as an R/V style because they had a V in the vin in the last few built, they just did not have enough VIN codes left to keep using the C/K codes. Look it up your self.

There is no question that the doors are the same. Just because the doors are the same part number does not mean that the 91 Suburban is a C/K truck. If the 88 body style is not marketed as a C/K, why on earth would GM put C/K on the serivce manual? I did include a scan of that. Look at the pic! CUCV trucks as a point, aren't C/K trucks either, they are D trucks. D = military. Now, one more pic to hopefully help you understand, a pic of my GM Parts Illustration manual. Note that it says 85-86 C/K and 88-91 R/V. I would like to see a scan (just one) of the cover of your parts manual that show otherwise! The facts just don't lie!

 

[Recovry4x4]

Is everyone on here a lawyer with the intent on being right? Why would I be concerned about a speedometer used in an 88 model truck? We're talking about the square body style trucks to 1987 and the same Blazer and Suburban to 91 using similar equipment as the CUCV? May as well include the Corvette because it has a C in it! The CUCV is based on a 84 style truck, not an 88 style truck so it would seem that an assumption could be made here. If I am talking CUCV with a GM diesel engine in it do I have to clarify I am not talking about a Duramax or a big arse Detroit Diesel tank pack or will I get bombarded with technical jargon? Or since you have one you built and put a MH-60M engine in it that runs on diesel then that makes it a possible option as well?

Really guys, this thread is amazing. Simple question with situation detail turned into a contest to see who is packing the biggest club. Sounds like Bill Clinton in here defining what "is, IS".

Thanks to the straight shooters, I appreciate your input as it has been helpful.

As I said earlier, sorry for the hijack. When I can, I will break this stuff out of your thread and put it in it's own, just can't let Steel Soldiers keep filling up with incorrect information.

 

[Jersey4x4]

You are correct I was typing quickly Crew Cab is correct. I have been working on a Dodge ans was thinking Mopar while typing. As for the other thing, Um ok.

Chevrolet and GMC never called their 4 door cabs a "Quad cab", they called it a Crew cab.

Dodge used the name "Quad cab".

BTW, I am tired of your argumentative, and negative comments in the forums. If it continues, I will not hesitate to give you some time off, or put you on "moderation".

 

[Jersey4x4]

Yes as I already said they are showing a year designation using VIN codes. Find a 1988 1500 in that book. C/K is a designation just like Fox Body for certain style mustangs, and Z06 for certain corvettes. Being a C/K series designated truck has never meant to be a VIN thing it was a body thing. The newer Chevy style is now Silverado which use to be a trim package but now it is a Silverado 1500 rather then a K10 But there is still a K in then VIN. Oh by the way why does that manual go up to 2000 like the previous post said?

There is no question that the doors are the same. Just because the doors are the same part number does not mean that the 91 Suburban is a C/K truck. If the 88 body style is not marketed as a C/K, why on earth would GM put C/K on the serivce manual? I did include a scan of that. Look at the pic! CUCV trucks as a point, aren't C/K trucks either, they are D trucks. D = military. Now, one more pic to hopefully help you understand, a pic of my GM Parts Illustration manual. Note that it says 85-86 C/K and 88-91 R/V. I would like to see a scan (just one) of the cover of your parts manual that show otherwise! The facts just don't lie!

 

[Jersey4x4]

I did just go one step further to be sure and called a place called Vineland auto Electric and they are an old school GM certified Gauge Specialist and they also gave me some pointers about the speedometer which I did not know. They told me on the older model(Like the cucv style) the head is the same for all intents minus the mounting of the cruise sensor on the back if it had cruise. But they dd say they can calibrate the head separate to the lower gear to be exact. Apparently the C50/60/70 series trucks used the same dash and the trans, gear, tire combo did not allow perfect speed accuracy so the speedo could be adjusted/fine tuned to correct "minor differences" They told me they have a machine that they run the head on and set the air gap on the flywheel on the back of the head to compensate for the differential. I just looked at the back of a speedo and there is some type of flywheel there and it looks like it can possibly be bent in and out from the main weight of the gauge. I guess they use special tools to do this. They also said the cable is the main cause of needle flutter but age can also cause it from old grease stiffening in the gauge. Now I never played with the gauges other then to do the same thing you did, to swap in one with a trip counter and it worked fine so I don't know but it made sense. The also said they made some of the conversion boxes to go on the trans then the cable goes on it and for a specific 10mph difference they said that would be the easiest fix. Just screw it on before the speedo cable and done. I looked in the TM 20P and found the thing I was originally talking about to see if you had it installed. it is shown in fig 249 page 539 as reference number 8 "8 PAOZZ 11862 368026 ADAPTER,SPEEDOMETER"
Do you have one of these?

Is everyone on here a lawyer with the intent on being right? Why would I be concerned about a speedometer used in an 88 model truck? We're talking about the square body style trucks to 1987 and the same Blazer and Suburban to 91 using similar equipment as the CUCV? May as well include the Corvette because it has a C in it! The CUCV is based on a 84 style truck, not an 88 style truck so it would seem that an assumption could be made here. If I am talking CUCV with a GM diesel engine in it do I have to clarify I am not talking about a Duramax or a big arse Detroit Diesel tank pack or will I get bombarded with technical jargon? Or since you have one you built and put a MH-60M engine in it that runs on diesel then that makes it a possible option as well?

Really guys, this thread is amazing. Simple question with situation detail turned into a contest to see who is packing the biggest club. Sounds like Bill Clinton in here defining what "is, IS".

Thanks to the straight shooters, I appreciate your input as it has been helpful.

 

[Recovry4x4]

Yes as I already said they are showing a year designation using VIN codes. Find a 1988 1500 in that book. C/K is a designation just like Fox Body for certain style mustangs, and Z06 for certain corvettes. Being a C/K series designated truck has never meant to be a VIN thing it was a body thing. The newer Chevy style is now Silverado which use to be a trim package but now it is a Silverado 1500 rather then a K10 But there is still a K in then VIN. Oh by the way why does that manual go up to 2000 like the previous post said?

You won't find an 88 1500 in there, you would have to refer to the 1988 C/K book for that. This parts manual covers 85-86 C/K and 87-91 R/V. I did post a pic of the 88 C/K service manual above as well as the R/V manual.

As far as it being a body thing, you need to let GM know about that.

I never said that my manual went up to 2000 but I have included a pic of the 1990 Parts Illustrations Manual. For some reason it has C/K on the cover.

No matter what you say, you can't post a pic of anything in a GM manual referring to a 1988-91 C/K suburban or blazer, they simply don't exist. NAPA only lists them as R/V just like GM. If I am wrong, please post a pic of something to the contrary.

 

[ODdave]

Ok, J4x4. so am i wrong in beliveing that C/K stands for 2 or 4 wheel drive?

Once again, OP I apologize for bringing the wrath of "god" (jersey) down on your thread.

 

[ODdave]

Ok, here is my PROOF that the square bodied (cucv) style of truck DID come with an electronic spedo, so to answer op's question, YES there are different spedos.

 

[soule64]

As stated, the GV has the correct sleeve and the correct gear. Nothing was changed other than the speedo. The bounce is gone but is off my 10MPH, not 10%.

I have a speedo from an 88 with a trip meter in it and similar miles on the odometer. I'll give it a shot since the speedo is the same. My concern was that the CUCV may have had a different calibration in the speedo itself.

Thanks! Have fun with your C/K argument.

DrJekl - I am willing to bet that the speedo gear isn't correct. I say this because my speedometer was spot on with GPS before I installed the GearVendor. I ordered it factory direct and was very specific about rear axle ratio and tire size. the rep even discussed having to build the complete package and installing the correct speedometer gear. Well, guess what - mine is 10 mph fast at 75mph (indicated) - 65mph GPS. I think they just tried to come close with the speedometer gear. I just said screw it and try to do the math in my head....

BTW - that transmission you sold me works great!

 

[soule64]

Ok, here is my PROOF that the square bodied (cucv) style of truck DID come with an electronic spedo, so to answer op's question, YES there are different spedos.

+1 on the electric speedo portion of this discussion. Only on '90-'91 Blazer, Suburban and Dually had 'em (Still a Square Body though!). I had to use one on a LSX swap I did on a '76 C-10.
Link to build and lengthy discussion on mechanical/electric and combo speedometers: Another LSx/4L60e Swap - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

This is a picture of a square body style fully electric speedometer cluster in the '76

 

[DrJekl]

The original gear in the GV was wrong as I bought the unit used. The sleeve was the correct one. Swapped out the gear.

I swapped the speedo for the one from the 88 Suburban with the swoopy trip meeter. I am running 80MPH on the speedo with an actual of 75MPH on the GPS. She runs steady so I am satisfied with it more so that the last unit.

If the adapter you refer to is the one used on the M1009 for the 3.08 gears, I am not running it. Thanks for the additional info on the tuning of the speedo.

Glad that trans is working good. I have one HMMWV 400 and two CUCV 400s left. I need to track everything down and get the place cleaned up. We're trying to PCS to Korea this coming year if possible. The M105s are getting scrapped because scrap is up and they are worth way more as Kia material than as a trailer!