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diesel, best ratio with 35's?

muddybuddy

muddybuddy

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i know for gasser's 4.56s are perfect for 35's. ive got an '86 6.2 with 700r4 3.08's and 35's. after driving at higher speeds, that ratio sucks. instead of regearing my 10b's, im going to swap in 3/4ton stuff since this is going tobe a work horse (i dont have a trailer, its gona be for loads to dump, mulch, collecting car parts, you know the drill). im thinking 3.73s or 4.10s right? those are stock ratios so i could snatch a set up pretty cheap. what do you think? i dont really plan to go bigger than the current 35's.
 
muddybuddy said:
i know for gasser's 4.56s are perfect for 35's. ive got an '86 6.2 with 700r4 3.08's and 35's. after driving at higher speeds, that ratio sucks. instead of regearing my 10b's, im going to swap in 3/4ton stuff since this is going tobe a work horse (i dont have a trailer, its gona be for loads to dump, mulch, collecting car parts, you know the drill). im thinking 3.73s or 4.10s right? those are stock ratios so i could snatch a set up pretty cheap. what do you think? i dont really plan to go bigger than the current 35's.
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I f you want the best economy and willing to baby the tranny when towing, go fo rthe 3.73
If you want to play it safe go 4.10
Both are stock gearings for the 3/4 ton so it would be easy and cheap.
:D
 
35's, 4.10's and the 700R-4 is perfect for a 6.2. Better power, and it puts the cruise rpm in the perfect zone for best fuel economy...1800 rpm at 65 mph.

Rene
 
tRustyK5 said:
35's, 4.10's and the 700R-4 is perfect for a 6.2. Better power, and it puts the cruise rpm in the perfect zone for best fuel economy...1800 rpm at 65 mph.

Rene
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Is there enough torque at 1800 RPM's to climb small hills etc.. (typical highway driving) without having to downshift?
 
x2 on 4.10's. 1800 is where a 6.2 wants to cruise for milage and 3rd is at the rpm for towing especially if TC locks up in 3rd
 
Wow, this thread was pulled back from the dead...zombie thread?

I like my 4.56's with a TH400 and 38" tires. OD would be good though. Drives nice now but OD would make anything over 55-60 friendlier.
 
AJMBLAZER said:
Wow, this thread was pulled back from the dead...zombie thread?

I like my 4.56's with a TH400 and 38" tires. OD would be good though. Drives nice now but OD would make anything over 55-60 friendlier.
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As I mentioned on another thread - I'm running 4.10's and 35's with an NV4500 (has overdrive) and at 65 mph I'm at about 2500 RPM's. My hope is that I can lower the RPM's and have more torque by swapping in a 6.5 diesel.

Thoughts?

William
 
You should be pretty good with the 35's and the NV4500 then. Nice around town torque but with the OD you won't be spinning it too fast. Not sure on the numbers though...these guys could figure it out. I don't even have a tach.
 
william_7900 said:
As I mentioned on another thread - I'm running 4.10's and 35's with an NV4500 (has overdrive) and at 65 mph I'm at about 2500 RPM's. My hope is that I can lower the RPM's and have more torque by swapping in a 6.5 diesel.

Thoughts?

William
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william, in 5th gear, with 4.10's and 35" tires you should be spinning at 1919 rpms. see here http://www.grimmjeeper.com/gears.html.

I run 35's and 4.10s with a th400. I always feel I could use more on the highway.

I want to run 35's, 4.88, and the NV4500.
 
Mikey von said:
william, in 5th gear, with 4.10's and 35" tires you should be spinning at 1919 rpms. see here http://www.grimmjeeper.com/gears.html.

I run 35's and 4.10s with a th400. I always feel I could use more on the highway.

I want to run 35's, 4.88, and the NV4500.
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Mikey von,

My hope is to sell the NV4500 and put in a 700r4 when i swap in the 6.5. I bought this tranny new and i guess have 5k - 10k miles on it.

Not sure what it is worth or if you want to buy it but thought i would mention it.

William
 
Why would you do that? The 700R-4 is a piece of crap compared to the NV4500, and the OD ratios are almost identical.

Rene
 
I've considered it...for ease of installation and the wife might actually drive it...but dunno...rather have a stick...
 
The 700r4 can be built but it'll never be a NV4500 or a TH400 for reliability.

If you are interested in the 700r4 you may want to check out this book over at the diesel page. It's got a section on a "performance" 700r4.

If you are going to keep that 6.2 around you may want to check out there other books as well, good stuff.
 
Jambi said:
The 700r4 can be built but it'll never be a NV4500 or a TH400 for reliability.
Click to expand...

But the money you will spend to "build" a 700R4 will equal if not exceed that of a NV4500 and still not last 35% the life of a NV4500.
 
Jambi said:
Exactly :wink1:
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Well, maybe you guys have convinced me to keep the NV... to be honest, i like an automatic but i may wait and see how the NV feels behind a 6.5 before making a decision.

Can you guys believe those sorry Cowboys?

William
 
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