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gear ratio
- Thread starter Hoot_223
- Start date
jwaller
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by pushing it what do you mean? too many rpm's for highway use or what?
Croatan_Kid
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Nah, especially if you don't have overdrive and run it at highway speeds. With no OD, 4.56s and my 11.00Rs I was still revving kinda high at 55 mph. Now I have OD and still only run like 60, but I can go a lot faster if I need to.
Bozor1000
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4:11 are okay. I would just keep the 4:56's and do a swap with a 700R4. Just my 
.
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Croatan_Kid
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That's what I did! I love my 700R4, 4.56s, and 39s!
CCATLETT1984
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i run 38.5's on mine with the stock 4.56 gears, runs great.
AJMBLAZER
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What they said.
For the time and expense of a gear swap on each end you could swap in a built 700R4.
For the time and expense of a gear swap on each end you could swap in a built 700R4.
CCATLETT1984
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you will have a harder time gaining speed.
crusty
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When you say the gears are free, does that include the front and rear carriers that are required with 4.11 and up gears?
Craig C
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Swapping Turbo 400 out for a 700R4
Can they be swapped out or do you need abapter plates etc. to replace the 400 with the 700?
Can they be swapped out or do you need abapter plates etc. to replace the 400 with the 700?
Croatan_Kid
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To swap over to a 700R4 from a TH400 you'll need:
a dipstick
a flexplate
torque converter bolts
a torque converter
a transmission
a 27 spline NP208 transfer case
a tall 700/208 adapter (they can be hard to find)
TV cable bracket (also hard to find)
lockup wiring
The two trans/t-case combos are almost exactly the same length, so no driveshaft mods are needed. Also, you go from a 2.48 first gear in the 400 to a 3.06 first gear in the 700 plus the 30% overdrive gear with a locking torque converter for maximum efficiency.
Also, the carrier break on a D60/14 bolt is 4.10 and down. You can run 4.11 gears on a 4.56 carrier. At least I'm pretty sure anyway.
a dipstick
a flexplate
torque converter bolts
a torque converter
a transmission
a 27 spline NP208 transfer case
a tall 700/208 adapter (they can be hard to find)
TV cable bracket (also hard to find)
lockup wiring
The two trans/t-case combos are almost exactly the same length, so no driveshaft mods are needed. Also, you go from a 2.48 first gear in the 400 to a 3.06 first gear in the 700 plus the 30% overdrive gear with a locking torque converter for maximum efficiency.
Also, the carrier break on a D60/14 bolt is 4.10 and down. You can run 4.11 gears on a 4.56 carrier. At least I'm pretty sure anyway.
AJMBLAZER
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Just to add to the above the whole swap can be done using nothing but GM parts. However it's up to you to gather those parts either bit by bit or by buying a whole vehicle with them all.