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Patrick's 3:55 ring & pinion install
#1185766 Fri Oct 07 2016 01:47 AM
Joined: Apr 2013
Posts: 54
T
thrs50 Offline OP
Wrench Fetcher
Finally got my all the parts to install the 3:55 ring & pinion in my 52 3100 3sp. Got it all installed with the help from the repair shop I use. Definitely notice a big difference in how it runs and happy with it so far only been a couple of days. Anyway I do notice a growling noise (almost like a down shifting noise) coming from the transmission when I let up on the gas. Other than that everything seems as it did before. Is that growling noise normal.

Re: Patrick's 3:55 ring & pinion install
thrs50 #1185778 Fri Oct 07 2016 02:38 AM
Joined: Jun 2011
Posts: 3,507
E
Shop Shark
It might be worn gearbox bearings, did you replace them? If not, go ahead and do them, they you can listen.

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.
Re: Patrick's 3:55 ring & pinion install
thrs50 #1185784 Fri Oct 07 2016 02:50 AM
Joined: Jan 2015
Posts: 1,038
3
Shop Shark
Was that noise there before you did the rear?

If there was no noise before then keep this in mind. When you change the pinion and ring gear they have to be set correctly for gear wear pattern, pinion bearing pre load.

It has been a long time since I did any rear end work so my memory is poor. I wish my dad was still here for he was the man to set up a rear. Though when you hear a noise when you apply the gas and or get a noise when you let up the gas and coast indicates that the rear was not set up correctly. Jeffrey

Re: Patrick's 3:55 ring & pinion install
thrs50 #1185817 Fri Oct 07 2016 11:41 AM
Joined: Sep 2012
Posts: 405
M
Shop Shark
** thrs50 ** Just curious when did you order the ring/pinion set from Patrick's? Patrick ran my credit card {without my authorization} June first for the set to the tune of $699.00. Have called several times to check on delivery. Each time the answer is two more weeks--two more weeks. Maybe there is hope after-all.

Re: Patrick's 3:55 ring & pinion install
thrs50 #1185861 Fri Oct 07 2016 05:44 PM
Joined: Dec 2006
Posts: 1,154
W
Shop Shark
My gear set was done here in Town by Geared-UP....the process is highly technical and the tolerances are very tight. The owner and installer has been doing only this type of work for over 15 years. You need to break in the gear set for at least 100 miles. No faster than 45mph for no longer than 20 minutes. This allows the oil to cool. No racing around or speed shifting. I had everything replaced he just used the carrier and the axel tube. It's as smooth as silk and the oil will be changed at 500 miles. Ours is an open driveline so we went with 3:38.1 and the difference in drivability is incredible. I also asked for a specific gear manufacture to be used as some of these Chinese manufactured gears are just junk.

Re: Patrick's 3:55 ring & pinion install
thrs50 #1185862 Fri Oct 07 2016 05:55 PM
Joined: Aug 2004
Posts: 1,391
ODSS Lawman
If you have a groan when you let off the gas that was not there before, it could mean the gears are not set up correctly. Do you have a photo of the gear tooth pattern?


SWEET
Sergeant At Arms
Old Dominion Stovebolt Society

BUNS?!?!?! Where we're going, we don't need no buns.....

1950 GMC 450 (25% owner)
1951 Chevy 1/2-Ton
The GreenMachine
In the Stovebolt Gallery [stovebolt.com]
Re: Patrick's 3:55 ring & pinion install
marzach #1185897 Sat Oct 08 2016 01:17 AM
Joined: Apr 2013
Posts: 54
T
thrs50 Offline OP
Wrench Fetcher
I waited 11 months he's a nice guy but his business is a real cluster #@$#@

Re: Patrick's 3:55 ring & pinion install
SWEET #1185898 Sat Oct 08 2016 01:19 AM
Joined: Apr 2013
Posts: 54
T
thrs50 Offline OP
Wrench Fetcher
No my mechanic set it up and I did not see it.

Re: Patrick's 3:55 ring & pinion install
thrs50 #1186115 Sun Oct 09 2016 09:32 PM
Joined: Aug 2004
Posts: 1,391
ODSS Lawman
If you paid someone then I would take it back and have them check it out.


SWEET
Sergeant At Arms
Old Dominion Stovebolt Society

BUNS?!?!?! Where we're going, we don't need no buns.....

1950 GMC 450 (25% owner)
1951 Chevy 1/2-Ton
The GreenMachine
In the Stovebolt Gallery [stovebolt.com]
Re: Patrick's 3:55 ring & pinion install
thrs50 #1186119 Sun Oct 09 2016 10:12 PM
Joined: Sep 2001
Posts: 30,126
ace skiver
Did you use an an installation kit like this one, or did they obtain the installation parts, especially new bearing sets?

My Suburban had an annoying "whine" when backing off on the gas, until I did the 3.55 conversion AND installed all those parts in the installation kit. My Suburban is now quiet enough to talk in a normal voice at 65 MPH (accelerating and "backing off" on the gas).


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
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