SLP 1-5/8" SS headers & full exhaust - too restrictive for 400 Hp?

Its more of a problem issue on Ford 9 inch rear ends Mike the crush sleeve failing.
A production Ford 9 inch rear has a 1.313" inch pinion stem diameter.
I think GM 10- bolt 7-1/2" is 1.438 " pinion shaft diameter.
Larger 10 - bolt GM 8-1/2 & 12-bolt musclecar 8-7/8" is 1.625"
Dana 60 Truck & Mopar Musclecar the pinion shaft diameter is 1.626" - 1.625"/
Pontiac Olds 9.3 1957-64 the pinion shaft is 1.875 " diameter.

To set up solid pinion spacers correct the entire rear diff must be taken apart.
Solid pinion spacers are used factory stock in all C3 Corvette Dana 44 from 1980-82.
Corvette C4 1984-1996 with Dana 36 7-7/8" & Super Dana 44 8-1/2".
Also used in all Truck Dana 60 from 1953- present.
And Mopar Musclecar Dana 60 1966-71.

Up to You Mike.
Something else likely to fail before the crush sleeve does in your 10-bolt diff.

Fastest 60 foot times you want to push is 1.5 -1.6 at the track.
1.0 -1.3 60 foot no can do......Dana 60 Territory Or Pontiac 9.3 Diff.
 
Dana 60 has a 9-3/4" ring gear diameter.
Theoretical the strongest & it is with aftermarket Race axle shafts & Full Race Spool.
 
When Bam is Gone and Trump is in Office....
Consider an aftermarket Strange Engineering S series Dana 60.
It has the 3rd & 4Th Gen F-body Torque arm provision.
A direct bolt in.
You can purchase just the housing & axle shafts.
Build to suite your needs and Budget $ plan.
Dana 60 is real HP Efficient also.
Pontiac 9.3 is too but won't fit your Trans Am without lots of 1-off fabrication work.
 
Maybe I'll leave it as is then. I'm not running slicks - I want radial tire wheelspin
as a "fusible link" to protect that rear axle from breaking.
 
The Jegs Aluminum Diff Cover with Preloadable Adjustable bearing cap stands I do recommend Mike.
Cheap insurance .

Original a Buick V8 Racer idea.
Invented by TA Performance over 20 years ago.
 
I am dropping a 383 in the 60 Impala. I would like to have full length headers. I have shorties on it now with a 350.

It is a 4 speed car, no air, no power brakes, but does have power assist steering.

Any suggestions for headers that fit and would work with a 475HP motor?
Click to expand...



http://www.summitracing.com/parts/hed-68236/overview/year/1960/make/chevrolet/model/impala
coated ceramic (PREFERRED)

http://www.summitracing.com/parts/hed-68230/overview/year/1960/make/chevrolet/model/impala
uncoated

yes they are 1 5/8" not 1 3/4 but youll need to concentrate on a higher mid rpm torque and not worry about peak power (I doubt youll lose 5-7 hp anyway) but your likely to gain a noticeably more robust 3000rpm-5000rpm torque. and from experience I can tell you I see far more reduction in power from restrictive exhaust behind the headers than the header primary diam. change.
ID suggest a full length 3" exhaust with carefully selected low restriction mufflers
before you buy any headers check with the manufacturer if they are [color:red]designed for strait or angle plug heads[/color] and ASK if the heads your using on your engine have posed a clearance issue as they are sure to have had complaints if they do!


http://garage.grumpysperformance.com/index.php?threads/is-backpressure-hurting-your-combo.495/

http://garage.grumpysperformance.com/index.php?threads/calculating-required-exhaust-pipe-size.11552/

http://garage.grumpysperformance.co...-guys-that-just-slap-on-factory-headers.3155/

http://garage.grumpysperformance.com/index.php?threads/building-an-exhaust-system-for-your-car.1166/

http://garage.grumpysperformance.com/index.php?threads/x-or-h-pipe.1503/
 
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