I bought what i thought was a t176. After some reading on here i checked the serial number and it ends in 89 which means its a t177. I also checked the first gear ration and its 3.82:1. Did jeep put these in cjs? All the info i've found on them says they were in fullsize jeeps only. It has the correct input shaft and factory adapter to a dana 300.
"The T177 and T178 are the J Series versions of this transmission as supplied with the 258 I6, and they feature significantly longer input shafts (than the T177) and bellhousing spacers to compensate for the deeper bulkheads of the FSJ Jeeps. The gearing differs as well. References to the T176 are largely similar to the other two versions. Failures of the T17x are more common in the Jeep trucks as they had greater weight and duty demands."
Are you sure it has the correct input shaft? Perhaps it's already been modified for your application.
Yes, CJ's used a short input shaft version of the T-177 I have one sitting in my storage shed that I got from a wrecked 81 CJ-5. I know of other T-177's that have come out of CJ's also. Novak and a few other web sites need to update their information. It makes sense that as AMC went to lower (numerical) rearend ratios to improve gas mileage in the 80s, that they would offset it by going to transmission with a lower first gear (T-177).
Thanks 80cj. I thought maybe they used them behind four bangers to help get it going. When you think about it swaping a 3.52 1st gear for a 3.82 1st gear isn't worth the time or money for parts. Either way I'm happy with the surprise of a lower first gear.