3:70 rear test run
Thread Starter
Instructor
Joined: Feb 2002
Posts: 152
Likes: 0
From: margate florida
3:70 rear test run
we got the rear in this weekend was a major PITA i now beleave in Murphy's law. well we did get it on the road sat. night ,went from a 3:08 to 3:70 . the car has a 454 LS6 and was already quick . it was like a different car the 3:70 gear felt strong i could see a in crease in RPM's rev up much faster. after a few 1st to 2nd runs the half shaft came apart :( we'll see what caused the brake down fix it :smash: and try again :cheers: i'm hoping it's just to much HP :D jim
Team Owner
Joined: Jun 2001
Posts: 43,136
Likes: 155
From: Thomson Georgia
Re: 3:70 rear test run (Tominator)
Sorry to hear that it broke......My car improved Dramatically when I did the rear from 3:08 to 3:73......Like night and day..What caused the Breakage..I did not romp on mine until like 150 miles had ticked by..They say to create a "wear pattern" on the gear
[Modified by Alwyn678, 2:33 PM 7/1/2002]
[Modified by Alwyn678, 2:33 PM 7/1/2002]
Tech Contributor
Joined: Aug 1999
Posts: 15,177
Likes: 3,994
From: Connecticut, USA
Re: 3:70 rear test run (1970LS6)
Good to hear,hope you get the 1/2 shaft fixed ok. I have just over 400 miles on the 373's I installed. The only problem so far was the parking adjustment was too tight after I rebuilt the rear bearings and arms.
Gary
[Modified by gtr1999, 12:02 PM 7/2/2002]
Gary
[Modified by gtr1999, 12:02 PM 7/2/2002]
Drifting
Joined: Mar 1999
Posts: 1,381
Likes: 15
From: Lusby MD
Re: 3:70 rear test run (1970LS6)
What trans are you running? A 3.70 might be a bit steep with a WR 4-speed like an M-20. Overal Drive Ratio in first would be the same as a 4.27 rear and an M-21. With all the torque of the LS-6 you're gonna have a tough time either: A) getting traction, or B) breaking stuff.
Looks like you've had your first taste of B
Looks like you've had your first taste of B
Team Owner
Joined: May 2001
Posts: 29,745
Likes: 3
From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
CI 6-7-8 Veteran
CI-VIII Burnout Champ
St. Jude Donor '06-'10, '13
Re: 3:70 rear test run (Aaron-74)
i went from a 190Hp to 350 and a 3.08 to a 3.70. I can't wait to drive it. It will be like death and life...
3.08's in there now --- 3.73's will be in there in 2 1/2 weeks.
I have the 700R4 transmission -- should make for some awesome first gear launches (tire smoking).
Burning Brakes
Joined: Aug 2001
Posts: 1,002
Likes: 0
From: Bay City MI.
Re: 3:70 rear test run (1970LS6)
I changed last year to a 3:70 rear gear, and now I have my BB 467 with the Muncie M-20. Things happen real fast with that setup!!!!! I had a 3:36 originally that probably would have been fine with the BB. It sure gets going fast, on the down side I am spinning 3100 rpms at 60mph. Like someone said it really depends on what tranny you have. For my setup the 3:55 would most likely been a better choice.
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Thread Starter
Instructor
Joined: Feb 2002
Posts: 152
Likes: 0
From: margate florida
Re: 3:70 rear test run (1970LS6)
got the half shaft and flange off last night looks like we didn't have the clips seated good. put a dent in the shock and another on the cross member the half shaft and flange are dameged and need to be replaced. but that seems to be all. well i'm not sure what trans. is in the car , i was told by the past owner it is a m22 but i'm not sure. all i know is it screams now. jim
Burning Brakes
Joined: Dec 2000
Posts: 962
Likes: 0
From: Carlisle PA
Re: 3:70 rear test run (1970LS6)
i was told by the past owner it is a m22 but i'm not sure. all i know is it screams now. jim
Team Owner
Joined: May 2001
Posts: 29,745
Likes: 3
From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
CI 6-7-8 Veteran
CI-VIII Burnout Champ
St. Jude Donor '06-'10, '13
Re: 3:70 rear test run (70PurpleLS7)
[QUOTEIf in 1st and 2nd you can hear the transmission over the engine, then there's a pretty good chance it's a M22, it almost sounds like a granny gear in a truck in the first two gears.[/QUOTE]
or a noisy camshaft gear drive ......
or a noisy camshaft gear drive ......
