Hi. Friend of mine got an 1982 CUCV Diesel 6.2 K5 with stock 3 speed auto and stock transfer case. He's putting on it some Russian millitary axles from a light armored vechile. These axles got approx. 8.40 R&P and he's planning to run 44" tires.
Here's a pic of this vechile:
http://armoured.vif2.ru/BTR-60PB_7.jpg

If he is to run his CUCV with these monster axles on 44" and stock transmission with x-case he's top speed would be approx 40mph (64kph) with max @ 3200RPMs.
He needs somethings to raise his ratio - at least 2 time so 0.5:1 x-case is desirable. What can be the solution?
I called OTT Industries (http://www.ottindustries.com/) and they offering reverse mounted NP203 but I am not sure if that would help. I am sorry I have hard time with all these ratios (no wonder why I failed 3 times Calculus in college) :rolleyes:
Thanks.

youre going to need to add an overdrive to your drivetrain but the only one off the shelf that comes to mind is the saturn overdrive that wont work for your application. the reverse mounted 203 would help if it will hold up, i dont think they were designed for that.

You could add a gear vendors overdrive, but you would only be able to use it in two wheel drive. That shouldn't be a problem, cause you probably aren't going to need 4wd after 40 mph anyways.

ryeguy had a big k5 with a caddy motor and unimog axles and he ran a 203 backwards as an overdrive with good results. he even sold the kits on his webiste to do it. Don't know if he still does or not but you might try him.

Spoken with friend of mine again. Now he's not sure what axles he wants to run. He's got 3 choices but with 42"-44" rubbers:
1. 8.40 R&P Russian millitary
2. Unimog axles
3. 14 bolt Corporate GM

I also did search on reverse mounted NP203 by OTT Industries. There it is:
http://www.bc4x4.com/fv/2002/hulk/hulk-37.jpg

http://www.bc4x4.com/fv/2002/hulk/

http://fourwheeler.com/featuredvehicles/86538/index3.html

Anyway, he needs to some overdrive no matter what axles he uses.
TheLakeRat - thanks for the lead. I'll try to contact ryeguy.

I found ryeguy's web site (http://www.exaxt.ca/)
I sent him e-mail.

you arent going to be needing an overdrive if you run a 14bff because the steepest the gears go are 5.13 abd with 44's thats a bit on the high side imo. go with the mog axles

What about running a divorce mounted NP200 (WW2 Dodge, Dodge M37, and Kaiser M715) or divorced NP205 mounted backwards?

How about a 700R4 (did they ever put those behind diesels so you could get the right torque converter?). They have a .70 overdrive......it's not the .50 you're looking for, but it might be enough.

I would also suggest a 700R4. A Klune V might also work for you

I've spoken with OTT Industries (http://www.ottindustries.com/) and they also suggested to get TH 700R4 because it has 0.7 overdrive.
Thanks for the suggestions.
Though the guy wants 0.5 in high range and he's seaking a bolt-on solution to go with his 6.2 Deisel.
I was not able to conact ryeguy re. overdrive and I'll keep on trying.

I've spoken with OTT Industries (http://www.ottindustries.com/) and they also suggested to get TH 700R4 because it has 0.7 overdrive.
Thanks for the suggestions.
Though the guy wants 0.5 in high range and he's seaking a bolt-on solution to go with his 6.2 Deisel.
I was not able to conact ryeguy re. overdrive and I'll keep on trying.


Does it get more 'bolt-on' than a new tranny (maybe bolt-in)? What bellhousing pattern is the 6.2/6.5L?

a 700 r4 will not stand up to 44's. youll be burning them up like crazy

a 700 r4 will not stand up to 44's. youll be burning them up like crazy



Ummmm......he's got 8.40 gearing. Why won't it?

700R4 would be the easy solution, they came stock behind 6.2s. You will need a new adapter, and t-case input gear if you want to run the stock 208. This should put you in the 2800 rpm range at 60 mph, which I would think would be about tops for a 6.2 trying to push 44s.

Pete

I would go with the backwards 203 and a stronger tranny. I think wagner machine made the setup...and it is just a "bolt on" as swaping in a 700r4.

so as I understand - thanks to your replies - there are really three options:

1. pcorssmit: transmission swap - getting TH 700R4 with adapter plate and t-case input gear (keeping stock 208) who'd make this adpater plate or is that a stock part?

2. rcurrier44: keeping the original 3 spd. auto. and reverse 203? what's stronger tranny i can get? i searched for wagner machine on the internet - do you have their phone # handy? thanks.

3. the way it's done on ryeguy's blazer: TH 400 reverse 203 with twin-stick custom 205

700R4 would be the easy solution, they came stock behind 6.2s. You will need a new adapter, and t-case input gear if you want to run the stock 208. This should put you in the 2800 rpm range at 60 mph, which I would think would be about tops for a 6.2 trying to push 44s.

Pete

I'm assuming that's a T400 3 speed trans. If it's a T400, it'll be 32 spline and would need the mods you mention. If it's the T350 (square pan with the corner cut off), you're in great shape as your input to the t-case will be 27 spline and supposedly the adapters interchange between T350 and 700R4.

If you 'sourced' the diesel 700 from a salvaged vehicle (which would be an interesting find in Russia), I'd take the whole trans, adapter and t-case. You'd be done as your stock crossmember will probably bolt up.

mbryson - thanks for the information on transmissions. i will try to identify what kind of transmission is in this Chevy. i'll try to take pictures of it and i'll post it here. i can also provide with truck VIN's.

finding parts, especially used ones in Russia for US made trucks/4x4 is a BIG PITA. thank God i have freight forwarder/consolidator/shipping agent in Brooklyn, NY, who ships for me to Moscow.

i also called Advanced Adapters. As I understood they might be able to build a custom Atlas t-case. i am looking forward to their's email with details.

mbryson - thanks for the information on transmissions. i will try to identify what kind of transmission is in this Chevy. i'll try to take pictures of it and i'll post it here. i can also provide with truck VIN's.

finding parts, especially used ones in Russia for US made trucks/4x4 is a BIG PITA. thank God i have freight forwarder/consolidator/shipping agent in Brooklyn, NY, who ships for me to Moscow.

i also called Advanced Adapters. As I understood they might be able to build a custom Atlas t-case. i am looking forward to their's email with details.


A picture of the tranny pan would easily identify it. T400 pan is kinda 'Texas' shaped......

Latest news: I just spoken with this Chevy owner - he is willing to ditch the auto tranny and get manual transmission. I asked him to take pictures of his auto tranny pan but would manual be better in that case?

Could that be Ranger with NV4500 combo then? I spoken with High Impact (http://www.high-impact.net/transmission_and_gear/overdrive_conversions.htm#ManualRangerApps) and looks like it's one of the solutions here.

I don't think you will really need the granny low range of the NV4500 and the OD won't be enough to get good hwy rpm's.

Look into adapting a T56 6-speed (with 2 OD gears) to the t-case of your choice. You could even use a divorce mount t-case and not have to worry about adapters (and it doesn't look like wheelbase will be a problem for you).

Triaged - thanks for mentiong T56! Divorce t-case is even better because he has divorced Mersedes G-Class t-case available for this vehicle.

Granny low range of NV4500? The only concern is how reliable is T56 compared to NV4500?

If T56 to be put in truck that weights more than 3 tons and it's going to pull 4 tons trailer - would it be able to turn 44" without buring the clutch if 1st gear in T56 is 2.66 (T56-Viper)?

So far I've seen T56 put into relatively light sports cars but would it work OK in a heavy Blazer that will be running in mud/clay/bog?

Then the only thing would to put T56 behind Diesel 6.2 and combine it with divorce t-case and then looks like all set.

But then T56 is a car tranny, while NV4500 cast iron case truck tranny. I think we'll go with NV4500 and a Ranger.

Granny low range of NV4500? The only concern is how reliable is T56 compared to NV4500?
I just ment that the NV4500 has about a 6:1 gear where first should be that isn't normally used on the street. I should have said "granny gear" and not low range. :grinpimp:

How about a Clark (or Clarke sp?) 5 sp or a Spicer 5 sp from a 2.5 ton 6x6 (check Boyce Equipment for the Spicer trans, I forget the model number - 3053?). Both are supposed to be good trannies.