4L60E Reverse only after hard launch
4L60E Reverse only after hard launch My trans broke today, looking for some input from the pro's.
The trans has all of the good stuff inside, beast sunshell, borg warner 29 element sprag, Raybestos Zpak, pump slide spring, pump vane rings, etc etc.
No problems for about 3000 miles, today, I leave a light easy and then went WOT at about 20 mph. It revved up like normal, 6700 shift, BANG. Car kept going, cam to a stop and no forward gears, reverse only. You can hear a whine while car is running and in gear.
Looking for ideas.
The trans has all of the good stuff inside, beast sunshell, borg warner 29 element sprag, Raybestos Zpak, pump slide spring, pump vane rings, etc etc.
No problems for about 3000 miles, today, I leave a light easy and then went WOT at about 20 mph. It revved up like normal, 6700 shift, BANG. Car kept going, cam to a stop and no forward gears, reverse only. You can hear a whine while car is running and in gear.
Looking for ideas.
I was told not to play with it since I had the Transgo HD2 kit.
I have had zero symptoms of a failure, that's what sucks. I thought if the forward sprag broke I would still have a manual forward gear? I have the 29 element Borg Warner. I guess see what broke next week when I pull it apart.
Thanks for your input, you probably correct.
I have had zero symptoms of a failure, that's what sucks. I thought if the forward sprag broke I would still have a manual forward gear? I have the 29 element Borg Warner. I guess see what broke next week when I pull it apart.
Thanks for your input, you probably correct.
I'm going to go with......you have a broken output shaft. It is broke between the input planet and the rear ring gear support. Just a guess but probably a pretty good one. Let us know what you find. Vince
On The Tree
Joined: Mar 2009
Posts: 144
Likes: 0
From: dallas, ga
I'm with vince. I broke an aftermarket output shaft right before the forward carrier splines once. Naturally I lost all forward range. If he broke the sprag, it would still pull off in m1 and m2 on the overrun clutch.
Trending Topics
On The Tree
Joined: Jun 2006
Posts: 165
Likes: 0
From: Pendleton, Indiana
Strange I took my 04 SSR out yesterday and when I turned on a country road I went about 3/4 throttle and bang and it just coasted to a stop, No forward gears at all only reverse, Lucky a friend was with me and lived close to where we was so he drove his truck in front of me while I drove home in reverse, RPM built mine and said it sounded like a forward shaft broke, I have a 4L60 and I don't know of any parts that will go in that tranny that will hold up with a weight of 4800 pounds and about 700 rwhp. I feel for you and know how you feel, Just got the engine built and was just breaking it in
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Mine is at least a cheap and easy fix, I can fix it myself luckily. You on the other hand have a 6l80e or minimum a 4l80e in your future.
Last edited by 69LT1Bird; May 8, 2010 at 07:58 AM.
