LT4 with an Auto?
Thread Starter
Race Director
Joined: Apr 2007
Posts: 10,215
Likes: 7
From: Lafayette LA
St. Jude Donor '09
LT4 with an Auto?
My lt1 with 35k on the ticker is leaking oil like a bucket shot with buck shot..
so my dad and I have deceided to rebuild it.
But we also know where an LT4 is. The only thing the LT4 is missing the heads,
But the real question is Could my Auto tranny handle the LT4?
so my dad and I have deceided to rebuild it.
But we also know where an LT4 is. The only thing the LT4 is missing the heads,
But the real question is Could my Auto tranny handle the LT4?
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
Probably. There are 2 very weak areas on the 4l60 and 4l60e transmissions made after 1990. The first is the forward sprag. GM decided to eliminate part of the cage that held the sprag element together. The single cage design tend to break rather easily with 400 plus hp. The sunshell also tends to snap the snout off. Both are easy addressed in a rebuild with aftermarket parts.
Safety Car
Joined: Feb 2004
Posts: 3,786
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From: Minneapolis MN
Race Director
Joined: Dec 2002
Posts: 13,348
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
35k miles is hardly time for a rebuild.Unless you just have to have the extra 30hp, fix the leaks.
(LT4 heads won't be cheap...)
If you really want the extra hp, forget the LT4 bottom end (it's essentially the same as your LT1) and just go with a heads/cam package on the LT1. Cheaper and every bit as effective as an LT4.
That's my $0.02
Larry
code5coupe
_________
Not easily impressed....
Le Mans Master
Joined: Dec 2003
Posts: 5,768
Likes: 33
From: Van Steel Corvettes
St. Jude Donor '12-'13
35k miles is hardly time for a rebuild.Unless you just have to have the extra 30hp, fix the leaks.
(LT4 heads won't be cheap...)
If you really want the extra hp, forget the LT4 bottom end (it's essentially the same as your LT1) and just go with a heads/cam package on the LT1. Cheaper and every bit as effective as an LT4._________
Not easily impressed....
Race Director
Joined: Feb 2003
Posts: 16,475
Likes: 270
From: Kingman AZ
Cruise-In VII Veteran
Cruise-In VIII
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Safety Car
Joined: Oct 2003
Posts: 3,597
Likes: 101
From: TN PA
CI 5-6-7-8-9-10-11 Vet
Read this. It is more than just the heads:
http://grandsportregistry.com/lt1vslt4.htm
http://grandsportregistry.com/lt1vslt4.htm
Nice link....Thanks
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