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Old 12-21-2008, 09:33 AM   #1
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a list of transmission specs for future swaps

this is a list of what seam to be popular and easily swappable transmissions. autos first then manuals

auto transmissions

th400
forward gearing: 2.48, 1.48, 1.0
approximate lenght: 24.25
output shaft: long,32 spline found in 2wd car or mated in 4wd to the np205, medium 32 spline mated to np208, short mated to np203
tons of aftermarket support
notes: jeep cases redesigned in 1974 with amc specific bellhousing, oil pan clearence can cause problems in passenger drop vehicals, takes around 62 hp to run

th350
forward gearing: 2.52, 1.52, 1.0
approximate length: 21.50
output shaft: 27 spline, 4wd have a 1in stickout past back of trany case
very strong aftermarket support
notes: pan shape can interfere with pass drop applications, takes much hp to run compared to the th400 and weighs 15 pounds less, takes around 36hp to run

th700r4/4l60e
forward gearing: 3.06, 1.625, 1.0, 0.70
approximate length: 23.37
output shaft: 27 spline, 4wd version have short shaft with 3in stickout past back of case, 2wd versionis longer and must be replaced with short shaft
1982 to the early 90s controled by tv cable { no computer} 93 and on use a computer
supported by aftermarket
notes: very deep first gear and a high overdrive

tf727/tf999
forward gearing: 2.40, 1.47, 1.0
approximate length: 16in to back of case
output shaft: 23 spline flush with case
found in 80 to 90s fsj {tf727} and 80s to 03 jeep wranglers
moderate aftermarket support
notes: DONT CONFUSE WITH THE TF904

manual transmissions

sm420
forward gearing: 7.05, 3.57, 1.70, 1.0
approximate length: 10.43in
output shaft: 10 spline
aftermarket has meny adaptor and rebuild kits availible
notes: becoming hard to find

sm465
forward gearing: 6.54, 3.57, 1.57, 1.0
approximate length: 12in
output shaft: short 10 spline 4wd mated to np203 and np 205, long mated to np208
good aftermarket support
notes: very availible

t18
forward gearing: 6.32, 3.09, 1.69, 1.0
approximate length: 11.87
there are over 14 different versions that jeep used not to mention ford

np 435
forward gearing: 6.69, 3.34, 1.79, 1.0
approximate length:10.875
output shaft: ford 28 spline, dodge 23 spline
aftermarket has some adaptor housings and t-case adaptors availible
notes: the ford version is more popular, the dodge version is more easily adaptible with the same round t-case pattern and 23 spline output as jeeps

nv3550
forward gearing: 4.01, 2.33, 1.39,1.0, 0.78
approximate length: 24.25
output shaft: 23spline flush with case
found in jeeps and dodge trucks
aftermarket has swap bellhousings and t-case adaptors
notes: well up to the task of v8 power and 37in tires

nv4500
there were two different versions of this, one of them was only made for gm for a year and a half and is not very common so i will write up the more common later version
forward gearing5.61, 3.04, 1.67, 1.0, 0.73
approximate length: 12.34
32 spline gm, 23 spline dodge
tons of aftermarket support
notes: dodge version is more common of the two

nsg-370
forward gearing: 4.46, 2.61, 1.72, 1.25, 1.0, 0.84
approximate length: 24in
output shaft: 23spline
found in 05 and later 4.0l, 3.8l jeeps
very slim to none aftermarket support
notes: overdrive not as good as most 5 speeds, but overall tighter gear split from second to fith will keep jeep 6 cylinders in there power bands. it is a good choice for i6 and v6 engines but not strong enough for v8 power, it only has a 270 foot pound input rating, also crank sensor is in wrong place for early fuel injected jeeps

i hope this can help some people and if anyone has anything to add please do so and my typing is horrible so please forgive me for mistakes

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Old 12-21-2008, 11:09 AM   #2
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The SM465 also came in a 2WD version that is also easily adaptable.
Its case length is 12 inches and has a 35 spline output shaft.
Both 2WD and 4WD versions are set up to run a PTO on either side.

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Old 12-21-2008, 08:30 PM   #3
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nice a 700r4 is definatly in my future...what vehicles utilized the non-computer (tv) so i can check yards?
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mine: 95' YJ-4"lift (Skyjacker) 2" body lift. chevy 350/th400/np241 swap. herculined interior, boat drain plugs for floor. TJ hood. 33" MTR. Up next: bigger axles.
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Old 12-22-2008, 06:22 AM   #4
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Quote:
Originally Posted by Felsengleiskette View Post
nice a 700r4 is definatly in my future...what vehicles utilized the non-computer (tv) so i can check yards?
Any of the GM stuff with TBI, so I think up to 94-95, if it's a Vortec then it's electronic and probably has a 4l60e anyway. Thinking about it I think all 700r4's are the same, 4l60E took it's place with electronic shifting.
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Old 12-22-2008, 03:47 PM   #5
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its 93 and on that use a computer for the 4l60e
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Old 12-22-2008, 11:55 PM   #6
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im glad to see a thread concentrating on transmissions. all i read on is t-cases, axles, and motors...good stuff brother!

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mine: 95' YJ-4"lift (Skyjacker) 2" body lift. chevy 350/th400/np241 swap. herculined interior, boat drain plugs for floor. TJ hood. 33" MTR. Up next: bigger axles.
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