The Stovebolt Page Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Some light reading


ENTERTAINING ADVENTURES

In the Stovebolt Reading Room

A little light reading
OR
Epic stories of old tin hunting!

Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
15 registered members (archburycontrol, DougH6100, dirtball, 68ironhead, Erik Husker, dschmit), 391 guests, and 3 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums48
Topics117,365
Posts938,474
Members42,915
Most Online1,229
Jan 21st, 2020
Image Posting Policy
Previous Thread
Next Thread
Print Thread
Page 1 of 2 1 2
Transmission upgrade needed #1119323 Sun Aug 16 2015 06:47 AM
Joined: Aug 2015
Posts: 17
6
60GMCFlat Offline OP
New Guy
Hi,
I recently acquired a 1960 GMC 1/2 ton flatbed with a 235 stovebolt, 4 speed transmission with granny gear...
I have been told; a T-5 Borg-Warner should bolt up correctly and run well with this nice little truck.
Right ?
Also, I am wondering how to identify what rear end I have in it. Posi-trac or not ?
Help, please.
Thank you.


Whatever you are doing, have a good time at it..... Ya gotta do it anyway... So, enjoy life !!!!
Re: Transmission upgrade needed [Re: 60GMCFlat] #1119379 Sun Aug 16 2015 06:09 PM
Joined: Sep 2011
Posts: 1,873
L
Lugnutz Offline
Shop Shark
Many of the truck owners here, myself included, are enjoying the T5 transmission for daily driving. Not a good choice for hot rodding as it will not stand up to abuse.

Another choice might be an early 3 speed with the solenoid OD (sorry but I can't remember the name).

Finding an S10 T5 that will allow you to keep the factory cable driven speedometer can be a challenge. If that is not an issue for you, then finding a T5 that fits will be a lot simpler. You just need to find the right gearing combination for your particular rear diff gear.

A Muncie pattern T5 can be made to bolt directly to your bell without an adapter plate, keep your same clutch package, shorten the drive shaft and cut a hole in the floor for the shifter. Here's a post of my T5 installation in my 1965 C10.

My signature link will take you to my BLOG with plenty of info on the T5.

Last edited by Lugnutz; Sun Aug 16 2015 06:10 PM.
Re: Transmission upgrade needed [Re: 60GMCFlat] #1119439 Mon Aug 17 2015 12:30 AM
Joined: May 2005
Posts: 6,541
B
bartamos Offline
Truck Whisperer
Not the motor that came in truck. The only real way to know what diff is to take off cover and read ratio on ring gear and examine for posi clutches. There are other "ways" to see wheel spin and count revs but go ahead and change fluid and check.


I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.


Re: Transmission upgrade needed [Re: Lugnutz] #1119454 Mon Aug 17 2015 02:26 AM
Joined: Aug 2015
Posts: 17
6
60GMCFlat Offline OP
New Guy
Hey,
Thank you much !!!!!
Exactly what I needed to learn...
Thanks again,


Whatever you are doing, have a good time at it..... Ya gotta do it anyway... So, enjoy life !!!!
Re: Transmission upgrade needed [Re: bartamos] #1119455 Mon Aug 17 2015 02:28 AM
Joined: Aug 2015
Posts: 17
6
60GMCFlat Offline OP
New Guy
Was it originally a 261 ?
I'll do the spin on the rear wheels..
Thank you


Whatever you are doing, have a good time at it..... Ya gotta do it anyway... So, enjoy life !!!!
Re: Transmission upgrade needed [Re: Lugnutz] #1119539 Mon Aug 17 2015 07:53 PM
Joined: Aug 2015
Posts: 17
6
60GMCFlat Offline OP
New Guy
Hello again,
I am looking into getting a used T-5 and having it rebuilt. my question is: what year and model T-5; will work best for my truck... I have a 1960 GMC 1/2 ton flatbed.. with 235, 4 speed heavy duty trans (currently).
any suggestions, or do I need the rear end gear ratio, also ?
Thanks,


Whatever you are doing, have a good time at it..... Ya gotta do it anyway... So, enjoy life !!!!
Re: Transmission upgrade needed [Re: 60GMCFlat] #1119540 Mon Aug 17 2015 07:57 PM
Joined: Sep 2011
Posts: 1,873
L
Lugnutz Offline
Shop Shark
The rear diff gear is important. Probably a 3.73 but it will make a difference. Also, what tire diameter will you run? A 235/75R15 is common for these trucks. That's a 29" tall tire.

Re: Transmission upgrade needed [Re: 60GMCFlat] #1119560 Mon Aug 17 2015 10:16 PM
Joined: Aug 2015
Posts: 17
6
60GMCFlat Offline OP
New Guy
Please allow my self correction ....
I have a 261.... not a 235 engine..
Thanks,


Whatever you are doing, have a good time at it..... Ya gotta do it anyway... So, enjoy life !!!!
Re: Transmission upgrade needed [Re: Lugnutz] #1119561 Mon Aug 17 2015 10:31 PM
Joined: Aug 2015
Posts: 17
6
60GMCFlat Offline OP
New Guy
Hello,
My OEM shop manual says it is either
a 3.90 = 3300 axle cap
or 3.38 = 3500
It is a heavy duty flatbed 261 4 speed.
model C-14 or C-15
help !!!!


Whatever you are doing, have a good time at it..... Ya gotta do it anyway... So, enjoy life !!!!
Re: Transmission upgrade needed [Re: 60GMCFlat] #1119565 Mon Aug 17 2015 10:49 PM
Joined: Sep 2011
Posts: 1,873
L
Lugnutz Offline
Shop Shark
If you have a 3.38 rear then you should look for an S10 truck T5 with a 0.86 OD gear. That will give you ideal highway RPMs at cruising speed. If you have the 3.90 rear then the 0.73 OD gear is best. 1988 and earlier S10 T5s are very hard to find but if you get one it is most valuable for the cable speedo connection on the tail stock.
The 1989 thru 1993 S10 T5 will also work but won't have a cable speedo hookup.

Page 1 of 2 1 2

Moderated by  Hambone 

Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.3