Scored a virgin TH475 - Chevelle Tech

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post #1 of 21 (permalink) Old Apr 2nd, 11, 1:33 PM Thread Starter
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Scored a virgin TH475

I responded to an ad on CL this morning. Time to upgrade the Camaro!

Picked it up for $100

How to tell a TH475 from a TH400:

Were installed in light heavy duty trucks and RV's (this one came out of an RV)
6 bolt converter
Factory deep pan
Tailhousing mounted parking brake
Internal: Straight cut planetaries!! (real reason I bought it)

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post #2 of 21 (permalink) Old Apr 2nd, 11, 1:36 PM
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steve
 
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Re: Scored a virgin TH475

nice buy
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post #3 of 21 (permalink) Old Apr 2nd, 11, 1:36 PM
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Rod
 
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Re: Scored a virgin TH475

I've always seen references to the TH475 but this is the first one I think I've seen a pic of. Need more pics if possible. What make or model RV's? Gas or diesel motor?
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post #4 of 21 (permalink) Old Apr 2nd, 11, 2:00 PM
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Re: Scored a virgin TH475

I used to do some of those on a fleet of 1 ton dualies hauling goosnecks full of Dr. Pepper. Severely overloaded. Exhaust manifolds would glow red....tried headers but they would burn through in about 2 weeks.

But the transmissions were pertty tough once we added more coolers to them. I used to scarf the straight cut gears out of the cores for my projects too! And adding the park brake pawl made them street usable.

Good score!

JIM

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post #5 of 21 (permalink) Old Apr 2nd, 11, 2:47 PM Thread Starter
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Re: Scored a virgin TH475

Gas 454 RV. The st planetaries should free up a little HP.
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post #6 of 21 (permalink) Old Apr 2nd, 11, 3:00 PM
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Re: Scored a virgin TH475

Is it me, or is the bell housing longer than a regular t-400?
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post #7 of 21 (permalink) Old Apr 2nd, 11, 3:11 PM
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steve
 
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Re: Scored a virgin TH475

it is you.... id like to find one of those... does it have the same gear ratio's as the th400?
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post #8 of 21 (permalink) Old Apr 2nd, 11, 3:48 PM
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Alan
 
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Re: Scored a virgin TH475

LOL.....Mark and his straight cut planetaries....

1971 Corvette
496" 657hp/675tq, pump gas
T400, Tight 10" converter
3.36 gears, 3600lb raceweight
10.59@127.51, 1.51 60'
STOCK APPEARING
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post #9 of 21 (permalink) Old Apr 2nd, 11, 4:25 PM Thread Starter
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Re: Scored a virgin TH475

Don't laugh Alan. Been talking with a performance transmission builder and also doing some reading on some other forums and the SC's can be worth a couple of numbers in 60 foot.

Now for the payoff.

The tranny was equipped with all the goodies and when I got it apart I've never seen a TH400/475 so nice inside. Rear thrust perfect, all pressure plates perfect, even had to tap the pump to pull it since it had never been apart or tapped. Scarf cut seals on the pump and drums, 6 clutches in the direct, 3 intermediate and 5 in the forward hub. Very nice piece inside.

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post #10 of 21 (permalink) Old Apr 2nd, 11, 6:00 PM
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Re: Scored a virgin TH475

Wow Garrett! I'm thinking this must be rare, because although I've heard about the TH475 I've never seen one nor heard of anyone who actually had possession of one. Some guys have all the luck!

70 Chevelle SS clone (632 CI powered).
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post #11 of 21 (permalink) Old Apr 2nd, 11, 6:40 PM
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Tony
 
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Re: Scored a virgin TH475

Thats a great score!! I forgot all about these I serviced more than my shair of them at my uncles trans shop some 30 years ago. I use to hate having too pull those when we freshened one up seemed like everyone went too lunch when it was time to lift it off the jack.
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post #12 of 21 (permalink) Old Apr 2nd, 11, 10:38 PM
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MARK
 
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Re: Scored a virgin TH475

Quote:
Originally Posted by ShouldntBeHere View Post
LOL.....Mark and his straight cut planetaries....
Ya, heaven forbid anyone doing things my way.
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post #13 of 21 (permalink) Old Apr 2nd, 11, 10:48 PM Thread Starter
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Re: Scored a virgin TH475

Quote:
Originally Posted by brngrhd View Post
it is you.... id like to find one of those... does it have the same gear ratio's as the th400?
I'll keep my eye out. Yes, it's a 2.48 low.
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post #14 of 21 (permalink) Old Apr 3rd, 11, 12:37 AM
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Re: Scored a virgin TH475

I know were one of those are with the bbc engine in front of it . Is it just the internals your getting or are you using the case to ?
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post #15 of 21 (permalink) Old Apr 3rd, 11, 8:17 AM Thread Starter
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Re: Scored a virgin TH475

The cases are supposed to be a little heavier also.
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