Pilot spacer for TH400 swap?
(i'm running a 6.0L btw)
Registered User
Joined: Apr 2002
Posts: 620
From: wisconsin rapids, WI
right here:
http://store.summitracing.com/partde...5&autoview=sku
also if your running a 6.0 there is a good chance you dont even need an adapter/spacer,, all depends on the year and trans it came with
my 6.0 in my s-10 had the flat flexplate with the gm spacer on it from the factory,, and the stock 6.0 flexplate has the th 400 bolt pattern on it already
http://store.summitracing.com/partde...5&autoview=sku
also if your running a 6.0 there is a good chance you dont even need an adapter/spacer,, all depends on the year and trans it came with
my 6.0 in my s-10 had the flat flexplate with the gm spacer on it from the factory,, and the stock 6.0 flexplate has the th 400 bolt pattern on it already
Last edited by jay_lt4; Aug 12, 2007 at 08:31 AM.
Registered User
Joined: Apr 2002
Posts: 620
From: wisconsin rapids, WI
someone make this a sticky
here are the facts about fitting an old style trans to the gen3 engines
1. the gm gen1,2 trans will bolt to the gen3 engines but you only use 5 bolts, the gen 3 engines do not use the middle bellhousing bolt on the pass side( no big deal)
2. you do not need a special flexplate, the curved 4.8,5.3,LS1- just need the t/c bolt holes ovaled out a bit and the 5.3 flex plates have a set of holes that match the small gm t/c bolt pattern perfect
- the 6.0 flat flex plate has the same t/c holes as the large gm pattern(th400 and most aftermarket th350 converters that have a dual t/c bolt pattern on them)
3. you need to use a crankshaft spacer when using a gen1,2 trans and converter there are 2 types:
- hughes gen3 crankshaft spacer part # hup-3795 $44 from summit/jegs, this spacer must be used with the curved 4.8,5.3,LS1 flexplates
- gm stock 6.0 crankshaft spacer 12563532 and longer bolts 12563533, this spacer can be used with either the flat or curved flexplate ( if using the curved style flexplate the flexplate goes on the crank first then the spacer goes on then the bolts, if using the flat 6.0 flexplate the spacer goes on the crankshaft first then the flexplate then the bolts)
i have used both style spacers, on several 5.3,LS1, 6.0 swaps and have not had any problems with either set up
here are the facts about fitting an old style trans to the gen3 engines
1. the gm gen1,2 trans will bolt to the gen3 engines but you only use 5 bolts, the gen 3 engines do not use the middle bellhousing bolt on the pass side( no big deal)
2. you do not need a special flexplate, the curved 4.8,5.3,LS1- just need the t/c bolt holes ovaled out a bit and the 5.3 flex plates have a set of holes that match the small gm t/c bolt pattern perfect
- the 6.0 flat flex plate has the same t/c holes as the large gm pattern(th400 and most aftermarket th350 converters that have a dual t/c bolt pattern on them)
3. you need to use a crankshaft spacer when using a gen1,2 trans and converter there are 2 types:
- hughes gen3 crankshaft spacer part # hup-3795 $44 from summit/jegs, this spacer must be used with the curved 4.8,5.3,LS1 flexplates
- gm stock 6.0 crankshaft spacer 12563532 and longer bolts 12563533, this spacer can be used with either the flat or curved flexplate ( if using the curved style flexplate the flexplate goes on the crank first then the spacer goes on then the bolts, if using the flat 6.0 flexplate the spacer goes on the crankshaft first then the flexplate then the bolts)
i have used both style spacers, on several 5.3,LS1, 6.0 swaps and have not had any problems with either set up
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