Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Determining a decent ratio
User Name
lost password?   |   register now

Thread: Determining a decent ratio Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
11-21-2007 09:26 PM
junkyardjeff I got my 5 speed for 75 dollars and I think there are three trans with different ratio spreads,the trans I have has a 4 to 1 first gear which might act like a granny gear with a steep gear. I am leaning towards a 3.55 gear for my truck instead of 3.73s then I woint need 5th around town. I have seen them priced all over the place so shop around. Jeff
11-21-2007 08:44 PM
shortyforty Here is a Excel speed calculator freeware I found that lets you play with a number of factors. Includes graphs of results.

Don't know if this link to it will work to download and save from.
11-21-2007 07:56 PM
31chevy How much should i expect to pay for for that S10 5 speed. I a looking into it for my 32 chevy 3:73 rear end and 250 chevy engine . What year too
11-20-2007 06:33 PM
speedydeedy Go with 3.73 and if first is too low drive it like the old granny gear and take off in second.This will be like having an under and over drive for if ever you really need to pull or climb a steep hill.
11-20-2007 04:12 PM
junkyardjeff The only concern I have is with the 4 to 1 first gear in the 5 speed,I dont want first to be like a granny gear with the 3.73 gears. Jeff
11-19-2007 10:37 PM
70 ElCam

You're going in the right direction with the 3:73s, as stated in the previous response. The question is if the 235 will pull the O.D. when combined with anything higher than that with the 235/75s you'll be running. As I recall mine liked to keep a little rev on it to pull hills good .

Nice calculator matt .
11-19-2007 09:15 PM
matt167 S10 T5 trans likely has a .72 ratio, but may have a .83 or .85 if your lucky, but these were more common pre 1985.

judging by the project 33 calculator, you'll be turning 1,725 RPM at 65 MPH in 5th. 2,549 RPM in 11st going 20 MPH.. with a 3.73

I'd say 3.73 would be a good choice but heres the calcs anyway
11-19-2007 08:48 PM
Determining a decent ratio

I am putting a new driveline in my 37 chevy p/u,I am retaining the 235 but installing a S10 5 speed and modern rear end. The 5 speed has a 4 to 1 first gear and in 5th the output shaft turns 1 1/3 to one revolution of the input shaft so it looks like there is not much overdrive,I was wanting to use 3.73 gears but with the 4 to 1 first gear it looks like a little taller gear will be needed. It has 235/75 tires on the rear so would a 3.25 to 3.55 gears be a decent choice for what I have. Jeff

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 10:45 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.