THM2004R swap - Team Camaro Tech
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post #1 of 6 (permalink) Old Dec 6th, 02, 07:18 PM Thread Starter
H5O
 
Join Date: Aug 1998
Location: Houston, Texas, USA
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I am rehabbing a 1975 Nova coupe (front IFS same as a second generation Camaro between 70-81), and have considered swapping a THM2004R tranny.

Can a THM400 x-member from a 1970-74 F-car function with a 75-79 X-car? My subframe has only 2 holes per side, and the stock x-member is for a manual/THM350 tranny. Over 5 years ago, I had a Muncie 4-speed which was used behind a 350; however, I am lowering a recycled 305, and have been undecided on recycling a THM350-C or use the 2004R.

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post #2 of 6 (permalink) Old Dec 7th, 02, 06:04 PM
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Join Date: Mar 2002
Location: Austin, TX, USA
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I generally like to answer transmission questions, but swaps is not my area of expertise. Particularly since your question refers to swapping frame componenets more than just the transmission itself.

Anyway, I have a nifty chart that shows transmission measurements. There are two measurements given - A and B. The A measurement is from the bell housing to the tailshaft seal. In other words - the overall length. The B measurement is not so clear. The illistration shows it to be from bell housing to tailshaft / case gasket flange. It would have been more helpful if this measurement was shown to be to the mount lugs. Maybe you can apply your existing unit's measurments to the table below and determine what B really means.

This data probably won't answer your question directly. On the otherhand, they should give you a good refernce. You'll just have to find out if both frames position the bellhousing in the same location, and compare the two crossmembers. Probably best to arrange to borrow the part you need for a test fit.

Trans.............A .......B.....Out-Splines
Powerglide........27 3/4"..20 3/4".....27
THM350............27 3/4"..20 5/8".....27
THM400............28"......27" ........32
2004R.............27 7/8"..27..........27
700R4/4L60.(1)....30 3/4"..22 1/2".....27
700R4/4L60.(2)....29 1/2"..27 3/4".(3).27
4L60E.............30"......22".........27
4L80E.............31"......29 5/8".....32

Notes:
(1) w/ std tailshaft housing
(2) w/ TH350 tailshaft housing
(3) w/ Caprice tailshaft housing.

Ref: Jan 2000 Chevy High Perfromance
"Swap Into Overdrive" Mike Petralia; pgs 28-35



[This message has been edited by dnult (edited 12-07-2002).]
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post #3 of 6 (permalink) Old Dec 7th, 02, 06:53 PM Thread Starter
H5O
 
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I am familiar with the chart; all I know is that the THM400 and 2004R share the same mounting space, and my previous tranny in the Nova was a Muncie 4-speed (1967 vintage).

I am saving the Muncie because parts are harder to locate, even if using Mobil 1 gear lube. I recall that Chevrolet and Pontiac offered THM400 x-members for 1970-74 F-cars, and I can e-mail a pic of the crossmember in my 75 Nova, which resembles the one used in 1975-81 F-cars.

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post #4 of 6 (permalink) Old Dec 9th, 02, 07:13 AM Thread Starter
H5O
 
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I recall that the 76-79 Cadillac Seville shared the same subframe with the second gen. Camaro and Nova; these were optioned with the THM400.

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post #5 of 6 (permalink) Old Dec 9th, 02, 07:49 AM
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H50 I think the answer to your question is yes, you should be able use the th400 crossmember from a 2nd gen F body in your '75 nova! At least as long as the frames are dimensionally identical from 2nd gen F body to 75 and later X body.

One word of caution though...when I had my '68 frame swapped for a '74 Ventura frame there were no provisions on the new frame for the th400 crossmember (my car has a th400!) and the shop had to measure off the old frame and drill some holes- no big deal unless your new frame is already installed (which mine was and they had to drop it again to drill)!

They should have placed both the frames side by side and checked all the mounting points, hose routings etc. and make the necessary changes before installing it.

In your case I would take some measurements from the back of the engine block to the potential tailshaft position (as in measurement A) and see if there are any mounting points on (or room for) on the frame.

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post #6 of 6 (permalink) Old Dec 9th, 02, 10:44 AM Thread Starter
H5O
 
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For a 75 Nova subframe, most of the IFS interchanges with a 70-81 F-car (exc. for 79-81 with larger outer wheel bearings), and the Seville uses 12 inch brakes up front with the 5 x 5 wheel BP (1971-02 Chevrolet pickups, passenger cars et.al.).

Any Camaro owner (sec. gen) can swap the 12 inch rotor spindles with the 1LE rotors (1988-92 IROC-Z with the 1LE option or B4C, 1991/92).

One way to fit a THM2004R is to flip the tranny pad around on a stock 75-79 Nova (75-81 F-car) crossmember. This means that the pad is rewelded; however, if I slid the crossmember back only 2 inches, I would have swapped a 4L60 (700R4) in its place. I am choosing the 2004R (Grand National tranny) out of an 89 Caprice, since I can re-use the driveshaft without trimming it 3 inches for a 700 swap.

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The Emissary
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The Vigilante
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Tales From The Crypt -- A-Cars
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Wallisville: Death Penalty Capital for GM A-Bodies
http://seributra_d.tripod.com/drow3.htm

1969 Chevelle Memories Page
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Chevelles (and A-cars) On Screen
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Disco-Era Classics
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Death of an Icon - The Westheimer Street Festival
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