Lou Earle Posted January 16, 2007 Report Posted January 16, 2007 I have a set of 3.55 rear end gears. I am thinking about installing them on a 48 Dodge or 48 Plym. Has anyone actually installed a set? If so what has been the result? Lou Quote
anthonyb Posted January 16, 2007 Report Posted January 16, 2007 Lou, I put a 3.55 set in my 41 Plymouth sedan in lieu of the original 4.11. It seems to make the top end speed a little higher without the engine screaming. It does throw off the speedo however. Mine ended up reading about 20% fast. I got a different speedo gear from Norm that should bring it more in line. I have a bit of a whine from the differential when coasting but that disappears when I give it a little gas. Time to correct the pre-load on the pinion, I guess. Quote
Lou Earle Posted January 16, 2007 Author Report Posted January 16, 2007 Was sold a set of 3.55 gears off ebay but they are actuall 3.9- I was had! Maybe- however they are new olod stock and perfect- anyone need them?? Lou Quote
Don Coatney Posted January 16, 2007 Report Posted January 16, 2007 Lou; I have 3.55/1 gears in my P-15. My big block Desoto engine pulls them well even when in 5th (overdrive) gear going up hill. Quote
Guest pizzafrank Posted January 16, 2007 Report Posted January 16, 2007 I also use the gear in my 48 sedan. It is nice on road trips , easy on the RPMS. Quote
Reg Evans Posted January 16, 2007 Report Posted January 16, 2007 I put a NOS set of 3.55 gears in the 49 Dodge I recently sold. It had the stock 230 engine and fluid drive and still accellerated just fine for me. Much less rpm at 60mph. I have another set I'm hoping will go in the 40 Plymouth I bought a couple of days ago. Sorry you got had on the 3.9 gears. Quote
Merle Coggins Posted January 16, 2007 Report Posted January 16, 2007 Was sold a set of 3.55 gears off ebay but they are actuall 3.9- I was had! Maybe- however they are new olod stock and perfect- anyone need them??Lou What do you want for the 3.90 gears? Will they fit the diff in my '50 3/4 ton truck? I"ve heard that the car diffs were the same. I haven't had my truck out on the road yet, but I'm thinking the 4.10 gears will have the motor screaming at highway speeds. Merle Quote
Young Ed Posted January 16, 2007 Report Posted January 16, 2007 Merle I think it will. I checked and the 4.1 set is the same part # for my WC and your B2C. I have a car 3.9 diff in my pickup. I switched the whole diff carrier etc into my truck housing. You should be able to stick these gears in yours. Quote
Merle Coggins Posted January 16, 2007 Report Posted January 16, 2007 How's your truck run with the 3.90's? Do you wish you had lower gears still? I'm wondering if the 3.90 would be OK, or if I should hold out for a lower set. I know the 3.90's would be better on the highway than my 4.10's. Merle Quote
Jerry Roberts Posted January 17, 2007 Report Posted January 17, 2007 Merle , I intially switched my gears in a 1939 truck from 4.11 to 3.9 and it did make a differnce . A very small difference . I suggest that you hold out for some better gears . Quote
Young Ed Posted January 17, 2007 Report Posted January 17, 2007 I'm happy with mine. Between the 3.90 and my tall radials I can cruise pretty good. I had a 3.73 set but it went into my coupe. Quote
James_Douglas Posted January 17, 2007 Report Posted January 17, 2007 I put a NOS set of 3.55 gears in the 49 Dodge I recently sold. It had the stock 230 engine and fluid drive and still accellerated just fine for me. Much less rpm at 60mph. I have another set I'm hoping will go in the 40 Plymouth I bought a couple of days ago.Sorry you got had on the 3.9 gears. Reg, Was that fluid drive with semi-auto, 3-speed, 3-speed/w/overdrive ? Also, coupe or 4 door? Best, James Quote
Lou Earle Posted January 17, 2007 Author Report Posted January 17, 2007 Yes I apparently hit the 10 instead of 11 when I divided and came up with 3.9 I actually have a39/11 which is 3.54545454etcThey have really made calculator better but not the goof using it!!. Don says he is fine with the 5 speed overdrive in the 48 with big block desoto. So, I believer the s-10 trans as about 27% reduction and the plym overdrive is about30% So, ere is my plan: Install 3.54 in the 48 taxi Install overdrive in taxi Install Asche built 230 engine( dual carbs , exhaust hight comp head, and hot cam ) in taxi. That way I should have a real screamer it lower and second and some good pulling power in overdrive which calculates out to 2.78 in overdrive. So what do you all think?? Lou Quote
Plymouthy Adams Posted January 17, 2007 Report Posted January 17, 2007 I think you need to park that taxi at my house..it looked right at home when you were last at the house with it. With our highways here in the south..go for it....you be ok.....and if you get caught in a hilly area..stay in third gear. Quote
Young Ed Posted January 17, 2007 Report Posted January 17, 2007 FYI Lou the ratio should be stamped right on the ring gear. Quote
Reg Evans Posted January 17, 2007 Report Posted January 17, 2007 Reg, Was that fluid drive with semi-auto, 3-speed, 3-speed/w/overdrive ?Also, coupe or 4 door? Best, James No James. It was just the standard 3 speed with the fluid coupling. Oh...forgot to say it was a 2 door club coupe. Quote
Reg Evans Posted January 17, 2007 Report Posted January 17, 2007 Sounds like a great setup Lou but you'd better secure that Taxi sign a little better. The wind shear and G forces might rip it right off. Quote
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