C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1990 Transmission sump bolt sheared

Thread Tools
 
Search this Thread
 
Old Mar 16, 2018 | 06:12 PM
  #1  
Tony Trans Am's Avatar
Tony Trans Am
Thread Starter
Intermediate
 
Joined: Nov 2014
Posts: 49
Likes: 3
Default 1990 Transmission sump bolt sheared

1990 Transmission sump bolt sheared, when changing filter and fluid. Any suggestions on how to remove it? Also where can I get a replacement bolt and what size is it?
Reply
Old Mar 16, 2018 | 06:53 PM
  #2  
WVZR-1's Avatar
WVZR-1
Team Owner
20 Year Member
Veteran: Army
Active Streak: 30 Days
Liked
 
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
Default

Originally Posted by Tony Trans Am
1990 Transmission sump bolt sheared, when changing filter and fluid. Any suggestions on how to remove it? Also where can I get a replacement bolt and what size is it?
Bolt is M8x1.25x20 - the OE is pretty damn hard. The head should be maybe marked 9.8. Is it in one of the locations that's a pass through and easily accessible top of the pan rail? Most are. Original would have a captive 'free spinning conical' washer on it.

Should be easily sourced. Correct GM is likely expensive. Visit a shop!

Last edited by WVZR-1; Mar 16, 2018 at 06:55 PM.
Reply
Old Mar 16, 2018 | 07:06 PM
  #3  
Tom400CFI's Avatar
Tom400CFI
Team Owner
Pro Mechanic
20 Year Member
 
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Default

Originally Posted by Tony Trans Am
1990 Transmission sump bolt sheared, when changing filter and fluid. Any suggestions on how to remove it?
First, spray it with PB. Then put some ATF/acetone mix on it. Then melt a candle on it. Then do a ritualistic dance....

Just kidding. Go right to what works; get a MIG welder, clean it up good, weld a nut onto what's left of the bolt....remove.
Reply
Old Mar 17, 2018 | 01:18 PM
  #4  
383vett's Avatar
383vett
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Default

There were millions of these trannys made over the years. Any tranny shop will have a bunch of these bolts lying around. Bring one of your good bolts to a tranny shop and they should give you a bolt or at most charge you a buck or two. If you're in the Bay Area, I've got a bunch of them.
Reply

Get notified of new replies

To 1990 Transmission sump bolt sheared





All times are GMT -4. The time now is 04:31 AM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE