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GM 55T Spider & Side Gear Source
#1330964 Thu Oct 24 2019 12:41 AM
Joined: Nov 2010
Posts: 99
G
'Bolter
Anyone have a source for new, or at least good usable condition, 1955-1962 GM 55T spider gears and/or side gears? I have a 55 1/2 ton open diff that I'd like to rebuild. I have all new bearings and seals, as well as a new ring & pinion set, and a new cross shaft. Unfortunately, some of the spiders and both side gears are a bit too worn. I'd like to replace them with something that has a little more life left. NOS would be perfect but, a set of good used gears that have not been abused is fine. If you know where I can find good usable GM 55T spider/side gears, or you have a set available, let me know. Thanks.


Ghost Rider
Little Egg Harbor, NJ
1942 Chevy 3/4 ton pickup, 1962 235, Offy intake, Fenton headers, Dual Carter YFs, 1984 T5
1956 Chevy 3100 Apache, 67 350SBC, Saginaw 4 speed, 69 12 bolt
Re: GM 55T Spider & Side Gear Source
Ghost_Rider #1330970 Thu Oct 24 2019 01:04 AM
Joined: Aug 2019
Posts: 244
O
'Bolter
Page attached from Toms differentials says that they can upgrade the axles & internals to newer 30 spline parts.

Attached Files
Pages13(1).pdf (348.34 KB, 12 downloads)

'59 Chevy Suburban, NAPCO
Re: GM 55T Spider & Side Gear Source
Ghost_Rider #1330980 Thu Oct 24 2019 01:39 AM
Joined: Jul 2007
Posts: 530
'
Shop Shark
Tom C,

What are the GM part #'s of the spider gears & side gears you need ?


George
'54 3600


1954 3600
Re: GM 55T Spider & Side Gear Source
Ghost_Rider #1331038 Thu Oct 24 2019 02:53 PM
Joined: Nov 2010
Posts: 99
G
'Bolter
The spider gears are GM 1358192 (10 tooth), the side gears are GM 3652344. I already have a new cross shaft and R&P, as well as all new bearings & seals for the diff pinion and axles. If I'm going to rebuild the diff, it does not make sense to use the old worn gears. This 55 1/2 ton diff is going into my 42 3/4 ton rear end, per the tech tip article on this site. Want to upgrade from the 4.55 diff that was OE to 1942 3/4 ton.


Ghost Rider
Little Egg Harbor, NJ
1942 Chevy 3/4 ton pickup, 1962 235, Offy intake, Fenton headers, Dual Carter YFs, 1984 T5
1956 Chevy 3100 Apache, 67 350SBC, Saginaw 4 speed, 69 12 bolt
Re: GM 55T Spider & Side Gear Source
Ott3r #1331039 Thu Oct 24 2019 02:57 PM
Joined: Nov 2010
Posts: 99
G
'Bolter
Ott3r:

Thanks for the info. I am looking at this as a possible alternative to rebuilding my 55 diff. It would allow for easier parts sourcing but, it is also an increased expense. Thanks again for your help.


Ghost Rider
Little Egg Harbor, NJ
1942 Chevy 3/4 ton pickup, 1962 235, Offy intake, Fenton headers, Dual Carter YFs, 1984 T5
1956 Chevy 3100 Apache, 67 350SBC, Saginaw 4 speed, 69 12 bolt
Re: GM 55T Spider & Side Gear Source
Ghost_Rider #1331041 Thu Oct 24 2019 03:03 PM
Joined: Aug 2019
Posts: 244
O
'Bolter
Good luck with the rebuild!
Another alternative might be sending your old gears to these guys:
https://www.rushgears.com/

I'd be interested to see a quote from them.


'59 Chevy Suburban, NAPCO
Re: GM 55T Spider & Side Gear Source
Ghost_Rider #1331066 Thu Oct 24 2019 06:04 PM
Joined: Jul 2007
Posts: 530
'
Shop Shark
Tom C. ,


Vegas Classic parts
phone: 725 - 600 - 7252

email : support@vegasclassicparts.com

Vegas has ( 1 ) spider gear GM NOS # 1358192

&

Llewellyn GM Obsolete
Northridge , CA .
phone : 818 - 363 - 5094

Talk to Scott the owner .

Llewellyn has ( 1 ) spider gear GM NOS # 1358192

PIC

https://i.postimg.cc/2yqbyPNN/Spider-Gears-1358192.jpg


Still looking for the side gears

https://i.postimg.cc/y8hJDmtx/GM-3652344-Side-Gear.jpg


Try

Phillips Muscle Car Parts
phone : 918 - 745 - 0784

Steve may have ( 1 ) side gear

&

Send an email to :

Bruce Bugay in Virginia

Bwbugay@aol.com

He may have a side gear

&

Keep checking ebay a few times a week

Type......... 3652344............ in the search box

One will show up eventually


George
'54 3600

Last edited by '54 3600; Thu Oct 24 2019 07:02 PM. Reason: add

1954 3600
Re: GM 55T Spider & Side Gear Source
'54 3600 #1331591 Mon Oct 28 2019 05:26 PM
Joined: Nov 2010
Posts: 99
G
'Bolter
Thanks George. I'll check them out. Basically, today I removed the spider gears and side gears from the carrier. What I found was not pretty. The surfaces that the side gears and spider gears ride on are very heavily scored. At this point, I'm going to need to replace the carrier as well. Starting to look like I need to find another alternative to change out this differential to a more modern carrier and gears. Guess I'll continue the research. If anyone has any experience with installing a later model differential or carrier, into my 1942 10 bolt rear axle, I'd appreciate the advice. I'm open to nearly anything that allows me to keep my OE 6 lug artillery wheels. Has anyone installed a later model axle that allowed you to use the OE 41-46 6 lug wheels?


Ghost Rider
Little Egg Harbor, NJ
1942 Chevy 3/4 ton pickup, 1962 235, Offy intake, Fenton headers, Dual Carter YFs, 1984 T5
1956 Chevy 3100 Apache, 67 350SBC, Saginaw 4 speed, 69 12 bolt
Re: GM 55T Spider & Side Gear Source
Ghost_Rider #1331622 Mon Oct 28 2019 09:34 PM
Joined: Jun 2011
Posts: 4,324
E
'Bolter
Are those wheels 6 on 7.25"? No other rear ends than 1 ton use that bolt pattern, I still have some of those wheels laying around.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: GM 55T Spider & Side Gear Source
Ghost_Rider #1331832 Wed Oct 30 2019 12:11 AM
Joined: Nov 2010
Posts: 99
G
'Bolter
Ed:

I believe the lighter 3/4 tons from 1942 used the 6 on 5.5 pattern, with 11 inch brakes. Doubtful I could use the larger components. But thanks for the input.


Ghost Rider
Little Egg Harbor, NJ
1942 Chevy 3/4 ton pickup, 1962 235, Offy intake, Fenton headers, Dual Carter YFs, 1984 T5
1956 Chevy 3100 Apache, 67 350SBC, Saginaw 4 speed, 69 12 bolt

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