cj5 trans help

Bullardbs

Bullardbs

Well-Known Member
Joined
May 7, 2007
Location
Thomasville, NC
I bought a 77 cj5 has a 3 speed in it and got a 4 speed with it well I sepperated the 3 speed and the transfer case and it seems like they are made together the trans came apart and the t case shaft is the trans saft so guess my question is what t case do I need for the 4 speed? THe 4 speed is out of a 80's jeep is what I was told have no idea what trans it is. So any help would be great thanks :beer:
 
What 4-speed do you have? t176? I have an 81 cj7 with the t176 & D300. Is the 3 speed a T150?
 
shouldn't be a t15 that was only used in pre76 models.
 
that looks just like it. But Im going in with the 4 speed and just trying to find out what transfer case I need and also on a side note do I need a clutch kit for the 4 speed or go with what go's with the year of the jeep and the engine in it?
 
77 CJ-5 should be a T150 3 speed with D20 behind it. The D20 is gonna be a differnt bolt pattern than the 80s CJ trannys.

Check the spline count and diameter of both tranny input shafts. I can't remember exaclty, but I think the T176 is the only 80-86 CJ tranny that is a direct swap with the older 76-79 trannies, but you'll also need an 80-86 Jeep D300.
Are the p/n's for clutch kits different for 76-79 T150 and 80-86 T176? If so, I'd use the T176 kit.
I think the T176 bellhsg should work, check the bolt pattern and input shaft lenghts.
The tranny skid/crossmember might need to be modified a bit to work, or relocated on the frame. I think I have a 80-86 crossmember if you need.
 
just to throw this in there. take a bunch of pictures and measure splines & shaft diameters & lengths and then shoot an email to partsmike.com He is a GENIUS with this stuff and will get you what you need. reasonable prices too.
 
I believe the T18/19 would be the only swap that (outside a $$$ adapter) will retain the D20.

The T176, SR4, & T4/5 all used the D300.

Sure, you'll have some coin in buying a D300, but will start with a better low range than the D20 and is cheaper to go lower down the road...
 
Bullardbs said:
thanks for the help looking for a dana 300 now
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Smart move the D300 has a much better 4 lo ratio. The D20 has a 2.02:1 where the D300 2.46:1, the difference is night day for trail climbs.

Doing a quick calculation with the 33's you plan to run using a t176 and 3.54 gears your crawl ratio with the D20 would be 27:1 where with the D300 it would 33:1.
 
jds97Wrangler said:
Smart move the D300 has a much better 4 lo ratio. The D20 has a 2.02:1 where the D300 2.46:1, the difference is night day for trail climbs.
Doing a quick calculation with the 33's you plan to run using a t176 and 3.54 gears your crawl ratio with the D20 would be 27:1 where with the D300 it would 33:1.
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Not to sure on what low is but that seems pretty low to me
 
Bullardbs said:
Not to sure on what low is but that seems pretty low to me
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Trust me if you going to be doing trail riding you'll be happy you went with the D300. I had the D20 3 speed in my CJ5 and it was horrible. My brother has one and just changed from the D20 3speed to the D300 4speed and the trail ride is different as night and day.
 
jds97Wrangler said:
Trust me if you going to be doing trail riding you'll be happy you went with the D300. I had the D20 3 speed in my CJ5 and it was horrible. My brother has one and just changed from the D20 3speed to the D300 4speed and the trail ride is different as night and day.
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Go with a t18 and dana20 if you want low. All stock no high dollar after market stuff. A t18 has a 6.32 first gear. It will more than make up for a .46 difference in the transfer case. Not saying there anything wrong with a dana 300, i have acouple, but if you talk low gear (even with conversions) a granny low 4 speed has them beat.
 
Bullardbs said:
in trying to find the time to make the trip to go get it
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Better check the output shafts lenths.Their is a short and long version of the 300 and IIRC the CJ5's have to use the short output.
 
read up...
http://www.novak-adapt.com/knowledge/model_300.htm

The output shaft is longer on 81-86 CJ D300's, 1980 is the short shaft. I never knew/heard CJ-5's always getting the short shaft 300, but it would make snese, with the tight wheelbase, to avoid steep driveline angles. There must either a flaw with the short shaft D300, or AMC was able to get away cheaper with the longer D300.
 
RenegadeT said:
I never knew/heard CJ-5's always getting the short shaft 300, but it would make snese, with the tight wheelbase, to avoid steep driveline angles. There must either a flaw with the short shaft D300, or AMC was able to get away cheaper with the longer D300.
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Now dont quote that as bein the gospel but its somethin along those lines.
 
A T18 and D20 combination provides a plenty low crawl ratio for 33's Way cheaper than adapting to a D300. If you can find that set up. The original Big Foot ran a D20 according to Novaks. They are plenty strong and CHEAP!!!!
 
Bullardbs said:
sounds good did his stock drive shafts work with the swap?
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Believe or no he is running a stock XJ front driveshaft and the rear drive shaft is the same length as a TJ slip yoke eliminator with the TJ having 4.5 inches of lift. But keep in mind he has 5-6" of lift because he did a SOA. Because of his lift he decided to with CV drive shaft.
 
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