Differential Shop?
#1
Racer
Thread Starter
Differential Shop?
Finished a track day yesterday in my C5Z and noticed on the drive home I have a loud howl on the freeway, increases under load, gone off-throttle. Shifts well, runs well, but with the ever present howl. Car has diff and tranny coolers but its possible the pump died (I know one of them was working b/c I could hear it when I turned on the switch).
Wondering if anyone has a recommendation to pull a differential/transaxle and potentially review and repair the diff/tranny cooler pumps/heat exchangers. ??
Thanks
Clarke
Wondering if anyone has a recommendation to pull a differential/transaxle and potentially review and repair the diff/tranny cooler pumps/heat exchangers. ??
Thanks
Clarke
#2
Melting Slicks
Member Since: Sep 2006
Location: Mill Creek Washington
Posts: 2,512
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There was a shop specializing in differentials in Kirkland but I recently learned they have closed.
I've recently diagnosed the diff as bad in my C5 Z as well. Similar howl to what you described. Speed related, becomes very clear at 29-30 MPH, disappears as soon as load is removed from the driveline.
Going to flush and replace fluid first then go from there. I've already begun to look at options to buy a new diff and swap them myself. Apparently the diff can be removed without dropping the entire driveline or even transmission.
I've recently diagnosed the diff as bad in my C5 Z as well. Similar howl to what you described. Speed related, becomes very clear at 29-30 MPH, disappears as soon as load is removed from the driveline.
Going to flush and replace fluid first then go from there. I've already begun to look at options to buy a new diff and swap them myself. Apparently the diff can be removed without dropping the entire driveline or even transmission.
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#6
Racer
Thread Starter
https://www.kirklandtransmission.com/ would be my first call.
#7
Le Mans Master
On factor is that they only have one lift where they can drop the drivetrain out, so scheduling is a factor.
#8
Instructor
Member Since: Mar 2020
Location: Lynnwood. Edmonds, WA
Posts: 176
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2020 C5 of the Year Finalist - Unmodified
GP Automotive is South Everett off 1238th close to I5. They repaired my drivers side differential on my C5 and did an awesome job.
https://gpautomotive.net/
https://gpautomotive.net/
#9
Racer
Thread Starter
My friend's shop is pulling the transaxle. I have been waiting for lift space at his shop. He talked to Kirkland as they are nearby my friend shop.
#11
Le Mans Master
#12
Racer
Thread Starter
That's how the national shops work that do transaxle rebuilds. Local shop pulls it and someone else rebuilds it. No different than a crate engine in that sense.
#13
Le Mans Master
Anyway, good luck - I hope you find someone to square it away for you.
#14
Racer
Thread Starter
#15
Racer
Thread Starter
Shop pulled the transaxle this week and dropped it off for rebuild. Shop owner said the fluid was very metallic, but that was no surprise based on how it sounded.
#17
Racer
Thread Starter
NW Differential in Monroe, WA is doing the rebuild.
#19
Racer
Thread Starter
Not that I know of. There is a shop near where Carb Connection is. They are the ones that Sam Stone at EVOMS went to talk to first. They were not interested in the work, but I don't know why.