racingjoe66
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I have found some, just the sellers can't tell me much about them but the part numbers. So any info to identify the ones I need is greatly appreciated or a site to run the part numbers
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You can do that, but then you will still have all the smallest U joints that were ever fitted to the Humvee. When they went to the four speed trans, the U joints were replaced with the larger ones, even at the diffs.Just take your driveshafts and have the front lengthened and the rear shortened at a local driveshaft shop. If you have a decent shop they should be able to do it for cheaper than you can buy a new shaft.
Did you use a GPS for that speed reading? When you start swapping parts, things get missed. There is a plastic gear in the transfer case that is specific to tires size, diff ratio, etc. That is a whole different topic.Did 75mph for the first time, felt like I was trying for the land speed record, but 65mph on the hi-way is awesome.
Retired War Horses is on point.couldn't agree more on the TH400...they are one of the strongest trannys on the market.
My trans guy told me this years ago....the 4L80E is good, but nothing like a TH400 on durability.
I am getting ready to do the 700r4 conversion in my 93 and have learned a few new things. Since it’s a 27 spline output shaft you either need to change output shafts or t case input. You can get a 32 spline output for the 700r4 but it is a stock shaft cut off with a 32 spline end welded on. It’s extremely rare to break the output on a 700r4 and you can buy HD ones. Some say this could be a possible weak point at the weld and the 32 spline shaft is expensive and not real easy to change. You can get a 27 spline input for your factory NP218 for $90 and it’s pretty easy to install. Some will even bolt up without aftermarket adapters. My 700r4 came from an 87 Suburban and aside from output shaft it’s a direct bolt on fit. The hardest piece to get is the TV (kick down cable) bracket. Some civilian vehicles came stock with a 6.2 diesel and a 700r4 and have the correct bracket if you feel like junkyard hunting. You can use a regular one for a 700r4 and customize it if you are handy with a grinder and welder. Someone a while back on SteelSoldiers had a place making them for him but can’t remember who. The TC lock up is simple to wire in. You can put it on a switch or there are kits for 12v or 24v break pedal switches. The TC lockup is something you need for both tranny’s. There are a few places selling kits for around $100 or less for the 700r4 or you can make your own. Only 4 wires and lots of diagrams online.
In my opinion you will spend less time and money having a 700r4 built up and changing the T case input. No drive shaft mods required. No moving crossmembers or changing gas tanks. Best of all no computer! These tranny’s are used in drag cars and many off road 4x4 vehicles so parts are cheap and easily available. They also have a lower first gear than the TH400 (I don’t know about the gear ratios in the 4L80).
With a 4l80 you need a computer, drive shaft mods, gas tank changed (if 93 or older), move your cross member and many other small things. Parts are more expensive for the 4L80 and there is computer controlled stuff that might not like the off road abuse some of us put our Humvees through. I don’t know if there is a way to make the computer waterproof and handle bumps and bangs but I am sure you could somehow. And for those worried about EMP’s frying electronics when the world falls apart probably want to go 700r4.
I guess it comes down to how much you have to spend, how close to original do you want to stay, what kind of situations will you be putting you vehicle in? I have a functioning deep water ford kit and full marine stereo so I plan on getting stuff wet and I would be nervous about water vs computer. If it wasn’t for the fact that the nearest town is 60 miles away I wouldn’t worry about a 4 speed but that extra gear and being able to do 65 mph without the 6.2 screaming will be GREAT!
That is awesome to know! The bracket is ridiculously expensive. Has anyone tried modifying the stock shifter to make it a 4 speed? B&M 3 speed shifters can be changed to 4 speed by changing a piece on the side. Basically looks the same only notched slightly farther for 4 gears. Didn’t know if you could use a dremel tool and make the factory one work. Probably just wishful thinking.dhaumann69166
You do not need a new bracket for the tv cable. The existing bracket (for the t400 kick down) and linkage to the injection pump works perfect.
Yes...but a guy is buying all 4 so he says.I think Board member 86humv has some 4 speed shifters for sale in the $350-$400 range.