High Performance Big Block Cadillacs
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Author Topic: Turbo 400 tailshaft  (Read 4983 times)
nitrojoe
C1
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Posts: 17


« on: January 05, 2010, 01:58:49 AM »

For my future reference , can a long tailshaft RWD Cadillac TH400 be changed to a short tailshaft ?
What is involved in the conversion ?

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~JM~
Shop Keeper
C5
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Posts: 1849


« Reply #1 on: January 05, 2010, 02:02:55 PM »

Yes, but I believe it requires a complete dumping of the "guts" to do it.
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PS. You don't have enough cam. Grin

...Summit has a kit for $99.... Shocked
dave brode
C5
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Posts: 1074


Best of 11.66, 113.96, 1.59 sixty


« Reply #2 on: January 05, 2010, 02:51:12 PM »

JM is correct, since the output shaft goes in first [along with trust washer]. Not that tough to do, if you aren't doing a full rebuild. End play should be checked, but it'd probably be fine.

The Ron Sessions TH400 book woul explain what's involved.

Kinda silly not to get a $100 and something kit and freshen it while it's apart though.

Dave
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3960 lb '71 C-10. 11.7-1 CR 514". PEP I beam rods floating MTS 18cc dish Probes, Elgin solid cam, home ported heads, MTS 2.19/1.84", Potter/Probe shaft rockers, edel 2115, 4781 850. Switch-pitch TH400, 12" 1800/3200 Tri-Shield convertor, 4.30 gears. Best so far of 11.66, 114.8 mph and 1.59 sixty
nitrojoe
C1
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Posts: 17


« Reply #3 on: January 05, 2010, 06:34:10 PM »

Thanks for the info guys .
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OldSub
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Posts: 36



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« Reply #4 on: March 13, 2010, 08:00:59 PM »

The Ron Sessions TH400 book woul explain what's involved.

I've been trying to buy that book lately and haven't found it for less than about $200.  Apparently it is out of print but still in demand.
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~JM~
Shop Keeper
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Posts: 1849


« Reply #5 on: March 14, 2010, 10:33:05 AM »

Hey there OldSub,

Check out your PM's.  Wink

~JM~
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PS. You don't have enough cam. Grin

...Summit has a kit for $99.... Shocked
OldSub
C2
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Posts: 36



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« Reply #6 on: May 11, 2010, 02:22:56 PM »

I've ordered the book online from several places and so far each accepts the order, then cancels a few days later.  If you have a copy of that book treat it like gold!  I'm still looking for a reasonable buy on one.
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Bruce Roe
C1.5
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Posts: 25


« Reply #7 on: May 11, 2010, 02:49:29 PM »

Actually, I don't see anything about long/short tails in the Ron Sessions book.  The factory service manual for about any '68 up GM big block will cover the trans just fine.  It is just assembled with a different output shaft & outer cover.  Note if your current setup has an O ring yoke or not.  Any trans over couple decades old needs all new seals (ESP the clutch pistons) to be reliable, regardless of mileage. 

If Ron Sessions goes any higher, mine will be for sale.  Somebody should do a CD.  Bruce Roe
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OldSub
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« Reply #8 on: May 11, 2010, 05:57:30 PM »

I've got a number of these trans including one 4x4 version and a TH475 with tail shaft brake.  At some point I'd like the TH475 parts in a Cadillac case with the tail shaft brake if that is possible.

2-Cadillac long shaft
1-Buick short shaft (BOPC NOT an SP)
1-Chevy 4x4
1-Chevy TH475

The newest one would be the Chevy 4x4 which is an '89.  The others are 70's or earlier.

I can imagine converting the second Cadillac trans to adapt to a transfer case, though that project is further away from proceeding.

I have the factory service manual for the '89 so maybe I don't need another book.
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steelybill
C3
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Posts: 190


« Reply #9 on: May 12, 2010, 12:55:28 PM »

The factory manual for the '76 DeVille I had  has a very good chapter on the TH400.
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OldSub
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« Reply #10 on: May 12, 2010, 06:34:54 PM »

I might have the '76 Service Manual but won't be able to check my shop for another couple of months.  Kind of a bummer but I'm barred from home until July for medical reasons. 

I know I have an '89 Chevy pickup manual and my '89 K3500 has a TH400 so it should have that chapter....  Its likely I have what I need except I'd like to know the gotchas when changing shaft lengths and making other mods, and that is what I was hoping to find in the Sessions book.
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dave brode
C5
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Posts: 1074


Best of 11.66, 113.96, 1.59 sixty


« Reply #11 on: May 12, 2010, 08:52:46 PM »

If one isn't going to freshen the trans [clutches, drum seals etc], only normal hand tools are required, and the only issue with changing tail shafts and extension housings would be checking the tail shaft end play. [dial indicator for that]

Dave
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3960 lb '71 C-10. 11.7-1 CR 514". PEP I beam rods floating MTS 18cc dish Probes, Elgin solid cam, home ported heads, MTS 2.19/1.84", Potter/Probe shaft rockers, edel 2115, 4781 850. Switch-pitch TH400, 12" 1800/3200 Tri-Shield convertor, 4.30 gears. Best so far of 11.66, 114.8 mph and 1.59 sixty
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