ratio and pinion

[roert]

sorry my english i right with translation.
i have a 1936 coupe with 21 bolt engine.
i restord my car.
I would like to go a little faster.
would you give me 3.54:1 or 3.25:1 recommend. and much brings about in mph
thank Robert

[petehoovie]

The smaller the gear ratio, less torque but higher speed. I'd go with the 3:54 to 1 of the two you mention. I think 3:78 to 1 is the best overall ratio.

[jimTN]

3:78 unless you are running on absolute flat ground and not in city stop and go traffic. 3:78 will put you up to 70 mph or so with a 221 basically stock engine.

[johndee138]

I will second the recommendation for the 3:78 gearing. Just did my 36 with it and am VERY happy. The stock gearing it came with (4:11) was fine for 1936 but not so satisfactory for 2015.

[qmdv]

I used to have a 29 rdst pickup with a B motor and a Cook four port head. 7.50x16 on the rear. I ran 3.27 to 1. It was great. Guess a B has more torque than a flat head.

Tim

[rotorwrench]

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Columbia overdrive would be better but 3.54:1 would get your top speed up a notch. It is harder for the engine to get it there though. The 3.78 is the best all around if you can't find the Columbia overdrive.

[VeryTangled]

Hi Everyone, I had the same problem with my '36 with 21 stud engine. Original rear gear 4.11:1, top speed 55MPH. Replaced with 3.78:1, top speed over 70MPH.

I got a whole replacement rear end, supplied by CharlieNY here on the 'Barn. I've never personally had a rear apart and back together. I am very happy!

Using a translator:
Hallo allerseits , ich hatte das gleiche Problem mit meinem '36 mit 21 Bolzenmaschine . Original hinteren Gang 4,11 : 1, Höchstgeschwindigkeit 55 Stundenmeilen . 1 , Spitzengeschwindigkeit über 70 Stundenmeilen : mit 3,78 ersetzt.

Ich habe eine ganze Ersatz hinteren Ende durch CharlieNY auf der " Barn versorgt hier . Ich habe noch nie persönlich hatte eine Rück auseinander und wieder zusammen. Ich bin sehr glücklich!

[Mr 42]

Have a friend here in Sweden running a 36 Convertible 21 stud original engine,
3,25 and its slow/hard to get running he don't like it and it takes quite a lot of fuel tom, probably because all the hard work it have to do.

så 3,54 or 3,78 will probably be the best.

[scooder]

Very tangled,
If yours only went 55 mph with a 4.11, it was not running right. Should easily do 70 + mph.
3.78 is best.
Martin.

[roert]

thanks

[Bassman/NZ]

Originally Posted by qmdv

I used to have a 29 rdst pickup with a B motor and a Cook four port head. 7.50x16 on the rear. I ran 3.27 to 1. It was great. Guess a B has more torque than a flat head.

Tim

a 29 r/p is a hell of a lot lighter than a 36 coupe.

[supereal]

If you need to drive at both city and hiway speeds, the best choice is an overdrive. Good Columbias are getting hard to find, and pricey, particularly for the early cars. I suggest you consider a Mitchell OD. I have an OD in my '47, and it gives the best of worlds: good power for starting out and hills, and comfortable cruising without over revving the engine. I have a 3:78 rear with a 30 percent reduction of engine speed when engaged.

[qmdv]

Originally Posted by Bassman/NZ

a 29 r/p is a hell of a lot lighter than a 36 coupe.

I am currently building a 32 highboy roadster. I have some 3.27 I was thinking of running with a 276 cu in flathead. should be OK. I think.

Tim

[scooder]

Tim,
It depends on what "drive" your after. I wouldn't go to 3.54, let alone 3.27! Do you want a hot rod or q highway loafer?
Martin.

[roert]

36 coupe
i think 3,78 is the best for me
thanks

[35fordtn]

If you have a original 1935-36 rearend you will have a hard time finding the correct 10 spline 3.54's. On my sedan I had to convert the driveshaft from 10 to 6 spline

[JSeery]

Originally Posted by scooder

Tim,
It depends on what "drive" your after. I wouldn't go to 3.54, let alone 3.27! Do you want a hot rod or q highway loafer?
Martin.

Like Martin's comments, LOL. I prefer the 4.11 gears myself, but if you want higher gearing I wouldn't go above 3.78. I know a lot of people do, but unless you are driving on the highway all day long I don't know why you would want to. As others have stated if that is really the objective I would go with an overdrive, best of both worlds.

[Talkwrench]

Not sure how much heavier a coupe is over a pickup but my little '37 21 stud turns over ok . 28 gearset, 3.78 rear and 7.50x16 tyres. in traffic every day no problems, don't even change out of top for some corners..