The Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Helping out ...


Check in for status!

Jump over to the Events Forum, to post events -- new ones or the ones we have been enjoying for some time.
Look to see what's been cancelled or postponed.

Encourage one another!

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
18 members (Harold41, Cosmo, Chapman, 3 invisible), 200 guests, and 2 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Most Online1,229
Jan 21st, 2020
Image Posting Policy
Previous Thread
Next Thread
Print Thread
66 c10 transmission
#1066031 Sun Nov 02 2014 05:33 AM
Joined: Oct 2014
Posts: 2
New Guy
Hi everyone. I have a 66 chevy c10 with a 3 speed trans on the floor. I'm considering in replacing it with a new trans.would a th350 turbo trans would make a nice conversion? Appreciate your thoughts and answers

Re: 66 c10 transmission
Chunks66 #1066845 Thu Nov 06 2014 05:39 PM
Joined: Apr 2005
Posts: 1,799
Shop Shark
There are many transmissions options and it all depends on what you want and what your skills and/or funds are. If you currently have a 3 speed trans it started out with a column shifter. The floor shifter has been added somewhere in it's life.
Your current configuration has the rear mounts located between the bellhousing and the crossmember. Any auto trans that you choose would have a mount near the rear of the trans. You would likely need to procure an aftermarket rear crossmember. You will need a flexplate, starter, either a new radiator with a built in trans cooler or a remote cooler and lines. Also, some sort of shift mechanism, and driveshaft modifications. Most current conversions involve a more modern overdrive trans such as a 700R4 or 2004R. However, there is nothing wrong with a 350 trans, it's just not an overdrive.

Last edited by rfs56trk; Thu Nov 06 2014 05:42 PM.

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
Re: 66 c10 transmission
Chunks66 #1067240 Sat Nov 08 2014 09:44 PM
Joined: Aug 2013
Posts: 1,042
Shop Shark
early classic enterprises has all you're looking for. Mounts, radiators, etc. you can build a truck from their catalog. They're in California also. There's a member named 4-5-6chevytrucks I think that has a shop dedicated to these rides also. Maybe he can help.

Last edited by Hollow65; Sat Nov 08 2014 09:47 PM.

I can explain it to you, I can't understand it for you.
Re: 66 c10 transmission
Chunks66 #1069995 Mon Nov 24 2014 07:47 PM
Joined: Oct 2014
Posts: 2
New Guy
Thanks for your help guys!well much needed advice

Re: 66 c10 transmission
Chunks66 #1070404 Thu Nov 27 2014 03:56 AM
Joined: Jun 2004
Posts: 8,253
Master Gabster
It is much easier to put in a different manual trans. then an automatic. You have to remove the major crossmember under the bell housing to put in an automatic. The 4 speed trans from a car is good. It has closer ratios then the 3 speed or the old truck 4 speed. A 5 speed manual with o-drive is a good choice as it gives a much better high way cruiseing gear.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
Re: 66 c10 transmission
Wrenchbender Ret. #1070451 Thu Nov 27 2014 04:11 PM
Joined: Jul 2008
Posts: 1,275
Shop Shark
To determine which transmission would work best for your truck you must 1st consider what the rear differential gear ratio is, the rear tire diameter is and how the truck will be used.

The problem with a car manual transmission is the first gear ratio isn't typically correct for getting a heavy load moving. The granny gear these trucks came with were there for a reason.

But if you are seldom pulling a load, or hauling a heavy load, a passenger car manual transmission will work as Wrenchbender describes above.

I have a Muncie 4 speed M-21 passenger car transmission in my truck, a 3.73 rear gear and 33" dia. rear tires. It is great on the highway, but you have to slip the clutch a bit to get it moving. Ideally a steeper rear gear (like a 4.11) would be ideal, used with an overdrive transmission, also as Wrenchbender discussed. This gives you a good overall gear ratio for pulling / hauling loads, but good highway mpg also.

This gear ratio calculator will help in sorting out what will work best:

Another thing to consider is an overdrive unit for your existing transmission.

Hope that helps thumbs_up


In the Stovebolt Gallery ~~ "The Orange Crate" 1965 C10 SWB Step Side Build Thread

Inspired to be different. Different in a way of my own, not in a way that others strive.
Re: 66 c10 transmission
Chunks66 #1071862 Sat Dec 06 2014 01:32 PM
Joined: Mar 2014
Posts: 33
Wrench Fetcher
Replaced my 3 speed with a turbo 350.Fairly simple,used junkyard parts,well worth it if you want a automatic.Overdrive would be nice,but would take a lot of driving to offset the cost of one.

Moderated by  Hambone 

Link Copied to Clipboard
Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.4