I have some another questions-
What are the differences between the
T-18 and the t18a besides a steeper first gear?
-Is length the overall length different?
-Different bell housing?
-Different input shaft length?
-Would the conversion with a large hole 18 tcase be the same between the two transmissions?
Thanks
Quest 1
Not sure on the delta on
T-18 , T-18a, and T-181b. Could be the a & 1b are the lower gears but not sure and do not think so. I have two
T-18 Jeep CJ
Transmission , both are T-181b...... but one is the 6:1 and one is 4:1 granny gears. MY 78
CJ7 vin shows it was stock with
T-18 and it has T-181b on the casting. The only way to know is to take cover off and count gears. The rev and first gears are different and the gear they interface is also different. To change/puchase the gears is also relaitive extwigve but the gears can still be purchased... is my understanding. I puch second one for spares and when counted gears its a diff ratio.
I have not seen much in print on
T-18 -1b case casting numbers... it might be the short CJ input shaft. There is only 2-3 (?)years you could get a CJ
T-18 and most that was optional. My
Transmission has 36k miles and the spare has 50k per owner that took it out to put in auto
Transmission for his fathers use. These are not easy to come by and even harder in good shape.
Question 2
T-18 cases are the same... the casting mark does change
T-18 , T18a, T181b. More Numbers? There are a few differences on the top cover.... Jeep
T-18 will have a square opening is one way to tell if Jeep. But... in ans to question most say the cases are same in use/dimension. Internals are interchangable and can also use
T-90 internals too.
Question 3
Bell housing can be used from several CJ Jeeps years. Many are already drilled and taped. Some have the spots but not drilled and taped. There are a few
Transmission types that will have the correct bell housing and would match... not sure off hand.. but research will tell you. The full size jeeps have a longer bell housing... too long and the
T-18 Transmission will have longer input shafts that cannot be used on CJ
Question 4
T-18 input shaft. To use the
T-18 in a CJ you need the short Input shaft and only CJ use this length input shaft. That is why the Jeep CJ
T-18 is more valuable. Others will requirre a shorter input shaft change and 1-2 internal gear changes too. Expensive parts $400 or so and will also need a press is my impression.
Question 5
No Idea... think the poster above ans that question. Seemed to know the 18
Transfer Case could be used with
T-18 discussed it & also mentioned a few advantages.. I think that is what I read the other day. Get older than the 70s CJ and I do know that stuff.
Just FYI... pretty mechanical.... but I do not see myself rebuiding transmisisons need press and measurement tools. Same for regear and lockers... need pinion deepth measuement tools, new bearings for each type of axle, 44,
AMC20 ,
Dana 30 , that are honed out so they can taken on/off the carrier w/o damage, need mag base measurement tool, case expander, gear set marking stuff, and extra shims.
I understanding wanting to keep your 5.?? gears on the rear. I am changing my gears 3.73 or 4.09 and lockers ft/rear. Gonna cost me lots of money because I cannot do it.