LS engine to replace a 305 TPI
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Any '98-'02 f-body LS1 will do. I'd recommend you go with the 4L60E transmission that comes with an LS1, rather than keep the TH700. The 4L60E is basically an electronically controlled TH700 with some upgrades.
LS1/4L60E combos go for less money than LS1/T56 combos, from what I've seen.
LS1/4L60E combos go for less money than LS1/T56 combos, from what I've seen.
Joined: Aug 2006
Posts: 12,804
Likes: 103
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: LS engine to replace a 305 TPI
the 4l60e came with the ls1 so its fine.
you will need aftermarket motor mounts for the ls1, im not sure about the crossmember, the exhaust from the header/manifolds would have to be fabricated to match up with the stock cat-back.
subframe connectors are a must for any f-body.
you will need aftermarket motor mounts for the ls1, im not sure about the crossmember, the exhaust from the header/manifolds would have to be fabricated to match up with the stock cat-back.
subframe connectors are a must for any f-body.
Joined: Jan 2002
Posts: 757
Likes: 10
From: Middle of MI
Car: 1989 Trans Am GTA
Engine: Stock LS1
Transmission: T56
Axle/Gears: 3.70 9 bolt
Re: LS engine to replace a 305 TPI
Gas tank, can be reused, but the pump is not likely to last for too long. I am doing the LS1 swap and put a 99 tank in it, that way I have the larger capacity, internal baffeling, new(er) pump and less weight. You will have to mess with the wiring a little I think (my dad is doing the wiring), and this thread should get you most of the way for making the gauge work correctly https://www.thirdgen.org/forums/ltx-...ml#post3439352
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