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Ok I am almost ready for this 700R4 swap but have a few questions and would sincerely appreciate advice. I have acquired the taller GM 14038663 transmission-to-transfer case adapter, new GM 25515599 TV cable, and infamous TV cable bracket. I plan to purchase a completely rebuilt 700R4 from one of several sources, such as Mad Dog Transmissions http://maddogtransmissionexperts.com/home/2665592 .
I will need to specify certain parameters to whoever I purchase the transmission from and this is where I need help. Here are my questions -
1.- Are there different 700R4 cases, and should I specify a rebuilt unit utilizing a certain case?
2.- I understand the transmission will feature automatic lock-up in high (4th) gear, however what if I am slow-pulling a trailer on incline and want to keep the transmission in 3rd gear? Will the transmission lock-up in 3rd if the gear-shift selector stays in 3rd? Or should there be some other way for 3rd gear lock-up, such as a dash-mounted switch?
3.- I will be coupling my stock NP208 transfer case behind the new 700R4. If possible I want the 700R4 output tail shaft to marry to the NP208 without having to modify the NP208. What specifications should I dictate to the transmission builder to achieve this? Is the NP208 a 30-spline input? If so, can the 700R4 be fitted with a 30-spline output shaft? What about output shaft length?
4.- My truck has 13,000 original miles and was babied on a National Guard base in Arizona for 25 years. Do I also need to install a new torque converter, or will my existing converter be OK? Same question for the flex plate. Can I used my existing, or should I go ahead and install a new one while I have it torn apart? And to clarify, I have the financial ability to fund all my projects, so forget the cost - if it should be changed, I will change it.
5.- Is the factory transmission cooler adequate or should I go ahead and install a larger after-market auxiliary cooler in front of the radiator with new lines back to the transmission? Please remember I want to do this right and will fund whatever is necessary to do so.
6.- What about the speedometer gear for the 700R4? I am currently running 37" HMMWV wheels and tires and plan to continue running these for the foreseeable future. The M1028 has 4.56 gears, so is there a specific gear I should specify to get the speedometer as close as possible?
7.- What are the things I am not asking? Are there things I should be watchful for? What am I missing?
As always, I sincerely appreciate the helpful advice available on SS and want to extend my gratitude to all that reply.
I will need to specify certain parameters to whoever I purchase the transmission from and this is where I need help. Here are my questions -
1.- Are there different 700R4 cases, and should I specify a rebuilt unit utilizing a certain case?
2.- I understand the transmission will feature automatic lock-up in high (4th) gear, however what if I am slow-pulling a trailer on incline and want to keep the transmission in 3rd gear? Will the transmission lock-up in 3rd if the gear-shift selector stays in 3rd? Or should there be some other way for 3rd gear lock-up, such as a dash-mounted switch?
3.- I will be coupling my stock NP208 transfer case behind the new 700R4. If possible I want the 700R4 output tail shaft to marry to the NP208 without having to modify the NP208. What specifications should I dictate to the transmission builder to achieve this? Is the NP208 a 30-spline input? If so, can the 700R4 be fitted with a 30-spline output shaft? What about output shaft length?
4.- My truck has 13,000 original miles and was babied on a National Guard base in Arizona for 25 years. Do I also need to install a new torque converter, or will my existing converter be OK? Same question for the flex plate. Can I used my existing, or should I go ahead and install a new one while I have it torn apart? And to clarify, I have the financial ability to fund all my projects, so forget the cost - if it should be changed, I will change it.
5.- Is the factory transmission cooler adequate or should I go ahead and install a larger after-market auxiliary cooler in front of the radiator with new lines back to the transmission? Please remember I want to do this right and will fund whatever is necessary to do so.
6.- What about the speedometer gear for the 700R4? I am currently running 37" HMMWV wheels and tires and plan to continue running these for the foreseeable future. The M1028 has 4.56 gears, so is there a specific gear I should specify to get the speedometer as close as possible?
7.- What are the things I am not asking? Are there things I should be watchful for? What am I missing?
As always, I sincerely appreciate the helpful advice available on SS and want to extend my gratitude to all that reply.