It's mine!!! '87 C10 swb

[87 STEPPER]

I would say if you think you did ok then thats all that matters.

But im gonna tell ya there were no '87's that ever left the factory with a 305/TH400 combo. all of them were TBI 305/350 & 700R4.

Fix 'er up and enjoy it.

Heres a 3 speed ind.
http://cgi.ebay.com/ebaymotors/1973-...QQcmdZViewItem

Heres a 4 speed ind.
http://cgi.ebay.com/ebaymotors/1973-...QQcmdZViewItem

[f.monroe]

There were 87's with 305/400 combos . I had a blue on blue Silverado a few years back that was a 305/400 combo . I think they were actually305/th375 but had the same pan as the 400 . I have seen many of the 305/400 combo trucks . What I have never personally seen is a 350/400 combo half ton . Frank

[LEEVON]

Originally Posted by 87 STEPPER

I would say if you think you did ok then thats all that matters.

But im gonna tell ya there were no '87's that ever left the factory with a 305/TH400 combo. all of them were TBI 305/350 & 700R4.

Fix 'er up and enjoy it.

Heres a 3 speed ind.
http://cgi.ebay.com/ebaymotors/1973-...QQcmdZViewItem

Heres a 4 speed ind.
http://cgi.ebay.com/ebaymotors/1973-...QQcmdZViewItem

87Stepper, thanks for the links. I'm bidding on another one from Ebay now. Are you sure about the 305/400 combo? I've checked the RPO codes and both are available in '87. I've got trans code M40 (TH400) and engine code L05 (305 TBI). I can't imagine it was a common, but I sure wish I had the 700R4! The gears are so low (2.41) though that it isn't too bad on the highway.

[MylilBowTie]

Its a long tail th400 with a smaller output shaft. Its a th375 those are turning up all over the place lately. When the weather clears up I will post pics of one.

[87 STEPPER]

Well i stand corrected you guy's are right.

I just dug out my original sales brochure and here's what it shows for available transmissions.

On all R10 series gasoline powered trucks for 1987.

Std......3-spd. man. column mounted.

Opt......4-spd. man./O.D. it dosen't specify if it's column or floor mounted.

Opt......3-spd. auto.

Opt......4-spd.auto./O.D.

The sale brochure dosen't state what auto tran's it is so i can't tell you for sure if it's a TH350 or 375, 400 you have.


WOW...........I ordered my truck in Jan of '87 and i never even seen that in the brochure untill today i guess it's because i kenw i wanted the 5.7 & 700r4 combo so i really didn't look at that back then.

[ElGracho]

M40 isn't always T400. In the 80's trucks, it just means 3 speed auto. Which auto it was depended on the GVW. Similar to GQ1 rear axle code which meant different things in the same year based on model and GVW.