HPI trans mount
Night Owl for life
Joined: Nov 2003
Posts: 24,719
Likes: 4,556
From: Bugs Bunny should'a made a left turn here
Thread Starter
Racer
Joined: Jun 2019
Posts: 457
Likes: 54
From: Dallas, Oregon
Thanks. I had seen this, but he say's "spec" when he talks about torquing, but he never says the number. It does help by showing where the bolts & nuts in the package go though. I's still like a set of the instructions...
Le Mans Master
Joined: Dec 2017
Posts: 5,563
Likes: 3,304
From: Virginia
2021 C5 of the Year Finalist - Modified
St. Jude Donor '21-'22
https://www.corvetteforum.com/forums...que-specs.html
This thread has the torque values for the stock diff mount. I would just go with those.
This thread has the torque values for the stock diff mount. I would just go with those.
Thread Starter
Racer
Joined: Jun 2019
Posts: 457
Likes: 54
From: Dallas, Oregon
https://www.corvetteforum.com/forums...que-specs.html
This thread has the torque values for the stock diff mount. I would just go with those.
This thread has the torque values for the stock diff mount. I would just go with those.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Thread Starter
Racer
Joined: Jun 2019
Posts: 457
Likes: 54
From: Dallas, Oregon
Already done. How did you tighten the bolts through the bar and into the differential case? I had to put two washerson the bolt to have enough head exxposed to use a wrench on them!
Le Mans Master
Joined: Oct 2008
Posts: 8,890
Likes: 981
From: Whitby Ont.
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
I installed the original Pfadt mount (same design) about 10 years ago, and it helped handling, but did little to dampen the hop, and there was some vibration. Decided to slightly modify the mounting by using spacers to increase pad(s) pressure on the spring, and also used non compressible silicone cut from old intake couplers between all metal to metal contact points. The end result was even less hop, and zero vibration.
Drifting
Joined: Feb 2002
Posts: 1,630
Likes: 125
From: Park Ridge Illinois
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
I installed the original Pfadt mount (same design) about 10 years ago, and it helped handling, but did little to dampen the hop, and there was some vibration. Decided to slightly modify the mounting by using spacers to increase pad(s) pressure on the spring, and also used non compressible silicone cut from old intake couplers between all metal to metal contact points. The end result was even less hop, and zero vibration.
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
Not even of the car. I've had 'er 20 years, and the picture phase has come and gone. The fitment issues can't be seen unless it's on a lift. BTW, I also installed an ECS trans/diff brace; a really nice piece.
Heel & Toe
Joined: Dec 2021
Posts: 21
Likes: 8
From: Central PA
Has anyone had issues with these causing extreme drivetrain noise at about 2.5k-3k rpm? The mount does its job, definitely a driving improvement but just cruising it sounds like a Huey helicopter is landing on top of me at certain RPM. Everything is tight and both pads are making contact with the crossmember.
Le Mans Master
Joined: Oct 2008
Posts: 8,890
Likes: 981
From: Whitby Ont.
Has anyone had issues with these causing extreme drivetrain noise at about 2.5k-3k rpm? The mount does its job, definitely a driving improvement but just cruising it sounds like a Huey helicopter is landing on top of me at certain RPM. Everything is tight and both pads are making contact with the crossmember.