Results 1 to 6 of 6
Thread: Help with transmission decision
-
02-09-2019 #1Registered User
- Join Date
- Feb 2019
- Posts
- 218
Help with transmission decision
I am working on the frame for a 67 dodge D100, and hope to have it boxed and ready for suspension installation soon. The original frame was for a d-200 which is just a heavy duty long bed. My question is about the transmission options. I have 2 trucks and Im trying to build one good truck.
It came with a New Process 435, which is a 4 speed. They came in 2 different ratio sets. The "A" had the following; 1st-4.56, 2nd-2.28, 3rd-1.31, 4th-1.0, Rev-5.64. The "L" had the following; 1st-6.68, 2nd-3.34, 3rd-1.66, 4th-1.0, Rev-8.26. I think I have the "L" transmission. My situation is that Im rebuilding my sons truck the way we discussed it, and he wanted a manual. The truck we are rebuilding has a newer 318 with an auto. Im not really sure about which auto, but we bought a shifter and never really got it to work well. Plus the transmission leaks a little and I think it was slipping as well.
I think I have two choices, and I was wondering what you guys think. The truck will be a driver, not a racer. Itll have an IFS from Jimmys Jalopies, and a triangulated 4-link with coil overs on all 4 corners.
Here are my possible options;
1) install the NP435, with a new clutch and pressure plate, and in the future put in a divorced splitter. I talked to gear vendors at drag week this past year, and they sell a splitter for the NP435 for about $3k. This would make it an 8 speed in effect. This would use the factory clutch pedal, and factory transmission mounts, and I wouldnt have to modify the transmission cross member. I might even be able to use the original clutch fluid reservoir. I might have problems getting a clutch and pressure plate for a 50 yr old tranny though.
2) Install the auto, after making a few repairs to it. This would be temporary though. I would work to install a newer modern 6 speed, like the one from a dodge challenger (I think its a TR6060). I eventually want a newer hemi also, so this would mate perfectly. BUT, the factory transmission cross member would have to be re-worked for the auto, then re-worked for the manual in the future. I also dont know if the clutch fluid reservoir or the clutch pedal assembly would work with a newer transmission. Used the newer transmissions are going for a little less than $3k. But it would also require a new clutch and PP. Plus I dont know where the shifter would be, and Im keeping the bench seat.
I guess there is the 3rd option of installing the NP435 and get the truck on the road, and make the call about the modern transmission later. From what I have read, the NP is pretty tough, but its basically a 3 speed, because who needs a 6.68 or even a 4.56 first gear. The new dodge 6 speed handle the hellcat, so close to 700 ft lbs. This would prevent me from cutting the manual transmission cross member out.Picture folder for Isaacs truck
https://drive.google.com/drive/folde...aN?usp=sharing
Isaacs truck build thread:
https://www.pro-touring.com/threads/...(Isaacs-truck)
-
02-09-2019 #2