[Scott Thelander]

so
9796239
9796240
483832

is one of these a convertible ?

or help me id the years and model these fit please ...

thanks

[dataway]

I'll get the number off my hardtop 68 tomorrow.

[68ragtop]

None of them are on Held for Ransoms list from earlier this year. Guessing you already looked at this......

How long are they?





.

['ol Pinion head]

The major problem with the above "LIST" is its a list of service parts printed in a master parts book many years after the earliest listed vehicles were built.

By going through earlier dated MPC's, many of the listings above can easily be noted as service replacements. Even with many earlier dated MPC's, am not sure that will totally identify what was original. I seem to remember different stamped part numbers for automatic & manual trans crossmembers in certain applications.

Superceded aka service parts example #1:
9797799 first shows up in my MPC's as: '69 3539 & 3739 H.T. (A-body 4door hardtop) applications
This same part number next appears as '71-72 ALL A-body exc SW (station wagon),
of course this does not include converts & 2 doors equipped w the optional boxed frame.
9797799 was definitely not used back in 1964, 1965, etc, only as a Service Replacement part over 10 years later.

Even with many earlier dated MPC's at hand, am not sure that one can totally identify what was original just from a parts book. I so seem to remember different stamped part numbers for automatic & manual trans crossmembers in certain applications. That is what we need to get down to, & that is going to take examining known original cars & the larger style build sheets for '68 & later Pontiac A-body's.

---------------------------------------------

9796239 is not in my early '72 dated MPC
9796240 is first listed as a '68-69 2 dr /4dr post, ie, std common unboxed frame application.
my bet is one of these numbers is for HD 3spd & 4spd, & the other is for automatic applications.

483832 is first noted as '72 V8 A-body with unboxed frame.

not going to be today, but will ck the original '72 crossmembers in my '72's

[rustedgoat]

Not the best pictures and they are upside down. The convertible cross member has more drop than a hard top. With the boxed frame the mounting point is higher vs just the lower part of the frame. You can see the difference in one of the photos. Also they are shorter in width 48" vs 55" for the hard top

[rustedgoat]

9796240 1970 Buick GS 455

His site has so much good info on it
http://www.buickperformanceclub.com/transxmbrs.htm

['ol Pinion head]

Originally Posted by rustedgoat

Not the best pictures and they are upside down. The convertible cross member has more drop than a hard top. With the boxed frame the mounting point is higher vs just the lower part of the frame. You can see the difference in one of the photos. Also they are shorter in width 48" vs 55" for the hard top

Pontiac & Buick A-body convert & HD frame crossmembers are easy to spot, as they are narrower than std width slide in style ends crossmember. '69-72 GP crossmembera are the same width, aprox 48", and shape, but are boxed, ie have a piece of formed steel welded across the deep channel of the crossmember.

Malibus, Chevelles & at least some '68-72 Olds cutlass converts used a tubular style crossmember that bolts to the frame.

['ol Pinion head]

Originally Posted by rustedgoat

9796240 1970 Buick GS 455

His site has so much good info on it
http://www.buickperformanceclub.com/transxmbrs.htm

Not just Buick GS 455, but a common '68-70 Pontiac V8 A-body use crossmember.

[Scott Thelander]

thanks guys

that helps .....

anyone with the 68 69 convert part number ?

Is Grand prix 68 69 the same as a convert ??

['ol Pinion head]

The GP trans crossmember will work on a late 60's -72 Pontiac or Buick A-body convert, as it's same length, same exact shape, just has the piece of steel welded over the channel & a different stamped part number. For the driver convertible crowd, the GP crossmember works fine, have sold a over a dozen. On several, I have used my brothers plasma cutter & my angle grinder to remove the steel plate.

Group 7.011
Crossmember-Support-Retainer-Washer, Trans Rear Support

'68-69 Pontiac A-body convert &
A-body 2door w HD frame option........9796243
'70-72 Pontiac A-body Convert &
A-body 2 door w HD frame option........9796243

'69-72 ALL G ....................................9798759

[dataway]

If it's any help the original cross member on my 68 hardtop, auto trans is 9796240

[Held for Ransom]

For '70 GTO's...

9796239 Coupe/Manual
9796240 Coupe/Auto
9796242 Convertible or HD Frame/Manual
9796243 Convertible or HD Frame/Auto

[Scott Thelander]

Thank you
for finding time to post up !

Scott T

[68pongto]

Here is the 3-1-1969 Master Parts catalog listings. It shows 9796240 w/std frame and 9796243 as conv. and H.D. frame. I think the difference between the 9796240 and 9796239 is that one of them has a slit cut in it on the drivers side for the parking brake cable to pass through, the other doesn't?

[bulletpruf]

Fellas -

Instead of starting a new thread, I thought I would join in the fun here and post my crossmember conundrum.

So, I pulled a 9790385 crossmember from my 68 Lemans convertible. It's 48" wide. Had a Super Turbo 300 2 speed manual trans and a 56" driveshaft. I'm not finding the part number anywhere, but I suspect it's the original crossmember; car had all original drivetrain. I'm currently not using the crossmember or driveshaft, and I could use the space in the garage.

Here's the question - I'm keeping the 56" driveshaft in case I decide to swap to an M21/M22 at some point. Would the ST300 crossmember work with a Muncie?

Thanks,

Scott

[dataway]

Check that part number real close ... if it doesn't show up ANYWHERE ... might have mis-read a digit.

[bulletpruf]

Originally Posted by dataway

Check that part number real close ... if it doesn't show up ANYWHERE ... might have mis-read a digit.

I have double and triple checked it -- it is very clear and I'm not getting any results anywhere.

Must be a one of one Ram Air V crossmember...

[gto4evr]

Originally Posted by bulletpruf

Fellas -

Instead of starting a new thread, I thought I would join in the fun here and post my crossmember conundrum.

So, I pulled a 9790385 crossmember from my 68 Lemans convertible. It's 48" wide. Had a Super Turbo 300 2 speed manual trans and a 56" driveshaft. I'm not finding the part number anywhere, but I suspect it's the original crossmember; car had all original drivetrain. I'm currently not using the crossmember or driveshaft, and I could use the space in the garage.

Here's the question - I'm keeping the 56" driveshaft in case I decide to swap to an M21/M22 at some point. Would the ST300 crossmember work with a Muncie?

Thanks,

Scott

yes it'll work. my 69 vert was an ST300 originally and I put the M21 from my 68 GTO I'd parted into it to save money when the tranny blew with no cross member or driveshaft change.

[dataway]

Originally Posted by bulletpruf

I have double and triple checked it -- it is very clear and I'm not getting any results anywhere.

Must be a one of one Ram Air V crossmember...

Put that baby on ebay for $1500

[bulletpruf]

Originally Posted by gto4evr

yes it'll work. my 69 vert was an ST300 originally and I put the M21 from my 68 GTO I'd parted into it to save money when the tranny blew with no cross member or driveshaft change.

Excellent! Thanks for the info.

Scott