You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
I already posted in the axle/tranny forum but no response..... thought maybe one of you guys could help me out. My 85 has a three speed and I''m not sure WHAT tranny it is or what the gear ratios are. It is not an OD tranny so I assume 3rd is 1:1, but I really want to find out what 1st (and 2nd) are. Tranny is bolted on to a I6 -300.
Can't believe I'm having a hard time finding info - here is what I have so far. Tranny is a TREMEC RAB/RAN/RAT ( I think those are 3 different varieties) 85 was the last year in a Ford truck from the factory.
Not related, but got to drive a 1963 Thunderbird with a 390 and some 3-speed Auto (Cruiseomatic?) with only 50-some thousand miles all original.....talk about a hot number! It just purred out on the highway, and was pretty serious. I loved it. Then got to take a 4-speed/3-transfer tractor around, that was fun too.
Thanks for looking.... I was also looking at the AOD, C6, and the T-18. I found all the automatics and manauls at various websites as well as here, but can't find much of anything on the TREMEC 3 speeds.
Mostly I'm thinking about the spare trannys / axles I have and maybe swapping. I have a couple ideas but still trying to evaluate engine, tranny, and rearends so I end up with the right mix of power and economy in each truck.
Pretty much... might be able to turn a T-18 from granny low and driving to driving and "overdrive like" economy by changing an AOD with 3.55 rear to a T-18 with a 2.74 rear.
The output on the T-18 is a drive shaft connector and the AOD is splined so I will need to swap out the driveshaft arrangement as well. I dunno yet tho as I haven't looked at all the torque RPH, HP specs to see how well this would work.
I was thinking there would be potential for this plan even though final drive on the T-18 is 1:1 because I could take advantage of the granny low by changing the rear fairly dramatically.
Am I crazy? I figured the engine considerations need to be figured in as well like torque, RPM, etc.....
I'd also like to turn a truck basicallt into a tractor... but I don't have any 4wd trucks ( yet)
I just had a thought. Figure the first gear in your 3-on-the-tree is going to be like the 2nd gear in your T18, 2nd gear would be like the 3rd gear, and 4th would be 1:1.
The T18 is a 3-speed with granny low, same with NP435. The ZF 5-speed is a 3 speed with granny low and overdrive. the 3-speed part doesn't change with transmissions, the split is *roughly the same. Now an M5OD is a 4-speed with overdrive, and there are Toploader 4-speed overdrives, basically a 3-speed with an overdrive.
I think we're thinking the same thing... the 1:1 of the T-18 acts like OD because I am changing the rear out. I just wanted to get the 3 speed 1st and 2nd gear ratios to match it up with the ratios when you take into consideration the rear ends.... It's all gear ratio x rear ratio and match up to see if they are roughly the same to figure out power diff... then I have to consider differences in engine torque at RPM to guage the feel of the power... or something like that! : )
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.