which tranny t90 t86 or t14 ?

does any one have a problem with a t-90 popping out of second gear. I had a t-86 in my 67 w/v6. I lost reverse so i put in a t-90 and it pops out of gear when you let off the throttle. which tranny is better? I can also get a t-14 for free but it was in a 73 with an inline six.will the t-14 bolt up to my dauntless? I have a model 18 transfer case and realize i need to by a new 10 spline gear. but does any one know what other problems may arise? basically I don't know which tranny to rebuild. :? :? oh before i forget i put many new parts in the t-90 sync assy. maindrive gear clutch shaft. everything but second gear cause it looked good still.oops

 

If it were me I would stick with the t-90. Poping out of second is usually a pretty good indicator a t-90 needs a rebuild as it is the gear that tends to get worn. I would guess that a new second gear would fix your problem, but if it looked good enough to put back in when you did the rebuild it could very well be another problem that is beyond me.

 

Go to the t1`4, those little t86 and t90 just dont hold up to any hard driving or harsh wheelin. Both make good door stops though. Seriously, put in the t14, alot stronger and more reliable

 

and the t-14 has a lower 1st gear and is syncro'd.

 

I thought i read somewhere that the t90 was a stronger trans. than the '86 and the '14, kind of been wondering about that myself. If so, since the '90 is already installed might be cheaper to keep it?

 

Nope. the t14 is the strongest by my infornmation. I can give testimonial as to the t86 and its inadequacies

 

The t-14 is not a good option in this case since it was behind an I6. I believe both the input and ouput shafts are different between the V6 and I6 varients.

 

The T-86 is essentially the same as a T-90 except for the beveled first-reverse gear (quieter) and the spiral splines on the main shaft (easier shifting). You can take the gears from a T-90 and put them in a T-86 case.

The T-90 is well known for popping out of second when the 2nd gear internal bushing is worn http://www.novak-adapt.com/knowledge/t90_rebuild.htm ... The T-90 is strong for its size; lots of Jeeps with T-90s were swapped to V8s, and they last ok with small tires and a driver with a light throttle foot.

Not sure about the T-14 from an I6, but I expect it has a different input shaft stickout, spline and pilot tip. Put the T-86 and T-14 side by side and compare them - if the stickout is the same, you can probably mix and match clutch parts and pilot bushing to make it work. If not, I'd look into getting an input shaft from a V6 t-14 and using the T-14. Not a hugely stronger trans than the T-90, but (as stated above) newer, synchro 1st, and better ratios.

<edit> Re the TC drive gear, looks like both the V6 and I6 mainshaft has 10 splines, so you'll need a new drive gear for the I6 T14 , an 18-8-50 (?) http://www.novak-adapt.com/knowledge/transfer_case_gears_grid.htm

 

It's been my experience that the T-14 is the strongest of the bunch but even the T-14 is pretty weak.. I broke two of them.. as stated above I dunno if the I-6 T-14 will adapt or not..


BUBBA

 

The I6 T14 does have a longer stick out than the v6 version does, if you can find the imput shaft it might swap out, you should direct this question more to Nickmil as he is the resident powertrain guru.

 

I really appreciate all your help. I love everything about my jeep other than the tranny options. I would love to have a 5 spd.

 

Sorry other than an NV4500 or NV3500, any 5 speed you put in is gonna be weaker.

 

A couple others that might be ok are the AX15 and the World Class T5 (not the Jeep T5 - it's a light-duty transmission). There's no cheap, strong and easy combination though.

There's a SROD (single rail overdrive) Ford 4-speed that's a pretty easy swap. R&P makes an adapter. http://www.5speeds.com/toploader.html

 

I wouldn't use the world class T5 in a Jeep a buddy of mine grenaded one of them in about a week of 4 wheelin with 33's and a stock 304. He said it was super smoothe but just lacked the overall strength to run with any kind of tire size and hold up.

 

I don't know of any cheap 5 speed swaps besides the T-5, but it is pretty easy to stick a T-18 behind the Dauntless and keep your Dana 18. You will never break a T-18. If you swap one in, it will be the last tranny swap you need - until you decide you need an auto for extreme rock crawling

The cheapest way to go is to find a T-18 out of a full sized Jeep and swap a Ford T-18 input shaft into it. A later CJ T18 catches a premium price but the FSJ version tends to be dirt cheap and only needs the input swapped to bring the overall length down to the same as the later CJ version. Novak has the details of the swap on their page, but is basically amounts to turning the T-18 input bearing retainer to GM dimensions, boring the pilot bushing (or buying a new one from Novak if you don't have a lathe), and making the holes match up. If your D-18 has the small hole, you'll need to rebuild it into a D20 case. I've done this swap twice behind a 258, once behind a 4.3 and just recently squeezed a Dauntless V-6 and a T-18 into my CJ2A. It's a pretty straight forward deal with no expensive adapters.