The Stovebolt Site Forums The Shop Area Engine Shop ? Gearing Help for 47-54 3600 Pickups?

Is there any lower ratio ring and pinion sets for the 3600 pickups. Top seed on these dudes is 60 if you really push it.

Any thoughts?

Walt Williams
La Verkin, UT

You could swap the whole rear axle for a newer GM 14 bolt with faster available gears (among other choices)

Try this thread
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=599879#Post599879

Grigg

Try a dana 60 from a Ford or Dodge van. It's a couple inches wider, but should fit just fine

54Belair,I posted a complete drum to drum,that is all complete,with 456gear ratio,that I replaced with an S10 4wd truck,with 373posi-trac,and hooked it to an overdrive transmission.I was asking 200.00,or best offer.I am located in Piqua,Ohio. Which is about 30 miles north of Dayton,Ohio. You can always replace the pig if you wanted. The rearend I have for sale,is out of 1951 Chevy 3/4ton,3600.Thanks

Z71 - it is OK to reference an ad you have posted in the Parts for Sale Forum but not OK to place an ad here which is what this looks like. Since your new I will not remove it but please be aware of the Administrators rules. Thanks.

My misunderstandings,I was just referencing the post.Sorry.

About what years of vehicles would the Dana-60 be found in? I would like to see if my local salvage yard might have one.

I do have a strong preference to want to keep my Chevy truck Chevy, but I will go look at one.

Thanks
Walt Williams
La Verkin, UT

My understanding is that the complete gear set from a '67- '72 Chevy 3/4-1 ton, with auto trans., is a direct bolt in swap,with, I believe 4:10 gears.

The 4.10 will fit. The trick is finding one.

For a Ford van Dana 60, I would try an early/mid 90's. For Dodge, just about any year should work. If you want to stay all GM, a 14 bolt may work also.

that is correct I just put one in my 49 3600 out of a 69 3/4 ton gmc 4.10 bolted right up

opey
so you are saying that you just swapped out the gears in the differential or you swapped out the whole axle?
i have a 53 3600 and would like to get some more speed out of it

rolf

If you find the elusive 4.10 rear, you change the whole center section. Unbolt the drive shaft, unbolt and pull the axle shafts, then unbolt the front of the differential housing. Don't drop it, it's heavy!
Reverse the procedure to install.
This keeps your original axle housing (and width) while upgrading your gears

ok then i'm looking for a
'67- '72 Chevy 3/4-1 ton, with auto trans

are/is there a way to id the differential of that gear set? casting# or some sort of id number?

i'll be back on this thread if i find one

rolf

There will be a code stamped on the front face of the carrier. I've posted the codes before, but for sake of saving a ton of searching for them, here they are again.
1967; HW, JU. These are listed as 4.11, may be Spicer rather than Eaton
1968; NA, NB, WI, RN (RN is listed as a 1 ton diff)
1969; NA, NB, OT, OW, OY, TF. There are also 1 ton listings; IE, LJ, LZ, MR, NZ, RN.
1970; TAA, THU, THW, TJU, TLN, TMZ, TNA, TNB, TOT, TTF, TWI.
1 ton; TIE, TIH, TLJ, TLX, TLZ, TMR, TNZ,TRN.
4x4 K20; TPW, TPX
1971; TAH, TAJ, TJA,TJB, TJP, TJS, 2G.
1 ton; TAK, TAL, TAP, TJK, TPZ.
4x4; TJH, TJJ,TKB, TKC, TKK, TKL, TKS, TKT.
1972; RAH, RAJ, RJA, RJB, RKK, RKL, RKS, RKT, RJP, RJS, RKB, RKC.
1 ton; RAK, RAL, RAK, RAP, RJK.
4x4; RJH, RJJ.
I do have listings for a 3.54 ('71 and '72) and a 4.11 ('67-'72). but from what I understand, those are Spicer differentials rather than Eaton, though I have seen a '72 with a 3.54 code on an Eaton differential.
BTW, most, if not all, GMC trucks from the '60s used a Spicer differential in the rear, either a Spicer 60 or 70 (I've senn them both ways).

longbox
will any of those listed above fit in the HO50? or just the eatons?

thanks
rolf

Hey Bill, don't know who we need to contact but we really need to list that in the permenent tips section. I've had a bunch of guys PM me asking me to check the numbers that they have on a gear they are looking at. I find myself just repeating the same thing over and over. That info orta be out there for everyone to access.

Denny Graham
Sandwich, IL

I agree with you, Denny. I got the information from the Chevy Truck ID Numbers book from Cars & Parts.
Rolf, the numbers listed are for the HO52 and HO72, essentially the same axle with the main difference being the brakes. They were manufactured by Eaton for Chevrolet. As noted, GMC used Spicer axles during that period, as did some Chevrolets with the leaf spring option, usually Camper Specials.

i've already saved that info to my computer
thanks longbox i may already have a line on one

rolf

Highflyer

How about the axle shafts? Do they insert into the "new" gearing?

Walt

High flyer, Axel shafts slide right in

longbox
i found a rearend stamped THW W14 (Then a number i couldn't make out) 2 on the front of the axle tube
i also found one the junk yard marked as a 4.10 but the RYZ code isn't on the list

what tools do i need to get the gears out?
and
is ther a procedure published on how to go about removing the gears somewhere?
i've never done it before
thanks
rolf

From oldgmctrucks site, http://www.oldgmctrucks.com/page0276.html
Pictorial with descriptions of what you are wanting I believe.

thanks randy it seems simple enough
is there a name for the company referenced in the article? if it's available i'd go with the 3.90 he mentioned

thanks again
rolf

Definitely doe the 3:90

I did the 4:10 center chuck swap and wish I had taken the 3:90 instead now that I have a 235 in place of my 216...I still can't use first gear

Maybe this is the company referred to as Carter in the article.
http://www.oldchevytrucks.com/

Patrick's
http://www.patricksantiquecars.com/

thanks guys
i checked patricks already. they have nothing for the 3/4 ton and advised me to do the 4:10 swap
i'll checked carters web catalog and they don't specify 1/2 or 3/4 ton. i'd bet their ring and pinions are 1/2 ton
i'm sure someone on this site would have done a 3:90 swap using carter by now
anyway i'll check today

thanks again

rolf

I found mine by searching junkyards online. I can't remember the name of the site but the guy was knowlegible and they inspected the center chuck before shipping.

I had the address on my old computer before is crapped out. It was something like east west auto

I think you might also check the website of a vendor in Vancouver, WA. It is www.chevysoftheforties.com They have a big inventory and trucks is a part of what they do. Ask for Chad. He is a knowledgable person.