The Stovebolt Site Forums The Parking Lot Tons 'o Fun third member

Boy I just scored big!!! I found a 67-72 3/4 ton gmc In a local yard with the H052 axle with 4.10 gears. looks like brand new on the inside & very little slack ( you want some ). All I'll have to do is replace the pinion seal & I'm good to go. this is going to be a really big improvement in my 50 3800. now that i have my broken speedo needle fixed & cable greased i realize i was going alot faster than i thought i was! now that i actually know that i'm going 50-55 it isn't near as loud. the 4.10s will be way better than the 5.14s going down the road & i'll still be able to pull anything i want too.
robert

Good find!

SWEEEEEET!!!!

just got it put in today. Man what a difference! like driving another truck almost. I'm running about 2400 @ 55 with 32" tall 750-17 tires. the 8r19.5s (33") I'm going to will drop it another 75 or so rpm. if you've got a 1 ton with 5.14 gears I highly reccomend this swap.
Robert

That is what I put in and I am very happy too.

but now the speedo is wrong. WW

of course it is. there are ways to adress this, adapters & such. when I said what rpm i was turning at a given speed i wasn't saying what the speedo actually read. when it says 45 i'm actually doing about 60. check this out: http://www.oldchevytrucks.biz/47_55/full.asp?page=162

Check out my 3800 at <oldjalopy.com>. That 4.10 3d member is sweet.

beautiful truck! If you haven't done it already put some sway bars on it, you'll love the way it handles. check out my pictures for the install on my truck. I used cpp's sway bar on the front & a front sway bar from a ford explorer in the back. pretty simple job and it didn't do any permanent harm to the truck's originality. even the crossmember I welded on the back could easily be cut off & ground smooth.

What are your plans for the old 5.14? Would you be interested in selling it or trading for any custom cnc plasma work?

Bluechev, did you swap the gear set only? My '62 dually also has the 5.14 gear and I'd like to go with a 3.70ish to 4.10 gear. Thought about swapping out the entire rear end but if just a chunk swap will work I'd go that route instead. Mine has a 283\4 speed.

willy the same rear axle assembly was used in 3/4 & 1 ton trucks from 1947-72 any of the third members will swap into any of the axle housings. 4.10 is probably the best you're gonna get. only other ratios made were 5.14 & 4.57. gm never made any thing else for this axle. an aftermarket 3.9 rring & pinion was produced at one time but know more haven't heard of anyone finding one anywhere. 1 tons usually have 5.14s, 3/4 tons usually have 4.57, unless its a V8 atuomatic truck then theres a good chans it's a 4.10. mine come from a 67-72 gmc 350 atuo truck

thanks for the info, bluechev. Found a 4.57 rear end in a local junk yard and the gears look good but that doesn't seem like enough of a ratio change to make much difference in top end speed.

I'll keep looking for a 4.10.

Willy,

That 4.57 set should add 5 to 7 mph to your top speed over the 5.14's depending on your tire height and rpm.

I had 5.14 in my 1 ton, and switched (whole axle) for 4.56, and it was much appreciated.

And I agree that 4.10 would be better unless you live in the hills and haul a lot of stuff.

Grigg

It's definitely a hauler and we have plenty of hills, may have to reconsider this. I use this truck for not only local hauling but also down the highway. It has to be able to do that occasional 300-400 mile road trip and 50-55 mph doesn't really cut it on the highway.

I have a set of 4.57 gears or a full 4.57 third that I could trade you for the 5.14 third.

Well...
My 52 1 ton with 4.56 gears had no problems hauling anything I could fit in the bed, and had no problems with road trips either.

Here's a picture of my truck just short of half way through a road trip..
http://rides.webshots.com/photo/2992098450080251109Zixjca

With a 235 engine 4.56 should be about right from my experience.
Sounds like you have a V8, does it have much more HP and torque? If so you may get by with 4.11, but then again might not?

Grigg

I have 7.50-17s on the back which are 32" tall. while I don't have much experience hauling any loads yet I have no problems maintaining speed on hills. as a matter of fact I live on a fairly steep mountain & I can start at the bottom going 55 & accelerate to 60 plus by the time I get to the top. I'll admit my way less than stock 261 certainly helps, but I had a 3100 with a stock 235 with the 3.55 gear conversion in it & it pulled the hills pretty much the same way. you guys aren't giving the old stovebolt engines enough credit. with 4.10 gears your truck will do any thing it already does only better.

Grigg, it has a 283 in it now. It had a newly rebuilt 235 which ran great but couldn't haul a load at any speed. With the 235 for example, on a hill with 3,000 lbs of gravel I'd have to drop down to second gear. That same hill w\o a load and I'd be in 3rd gear. Now with the 283 I can pull the hill in 3rd loaded and in 4th empty. So I can definitely run at higher speed and get up to speed faster with the V8.

So I guess I'm trying to figure out how the truck would do with the 283 and 4.11 gears while hauling 3,000 lbs. Would it be that much different than a 3\4 ton longbed pickup with 4.11's? I'm not sure what the difference in curb weight is between the dually and a longbed pickup so if the dually weighs a lot more to begin with then maybe the 4.11's aren't a good idea for hauling.

With that info 4.11 sounds like a good choice for you.

Grigg

Grigg, thank you.