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06-06-2007, 06:17 PM
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#1 |
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Prestige member Old Farts Club
Join Date: Nov 2005
Location: Cleveland
Posts: 502
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RPO codes
any one know why some trans are listed M49 and mine is a M38 is it just TH400 and TH 350 - one site I found said the M38 was a TH 375 (TH 350 with some TH 400 internals) any truth to this ?
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06-06-2007, 06:36 PM
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#2 |
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Prestige member Old Farts Club
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Re: RPO codes
anybody ?
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06-06-2007, 08:56 PM
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#3 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
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Re: RPO codes
without looking at my books... I wa thinking the M38 was the powerglide.
Both the Th400 and Th350 were M49 |
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06-07-2007, 07:02 AM
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#4 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,852
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Re: RPO codes
What year is your truck?I`m guessing the same as Longhorn Man.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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06-07-2007, 06:12 PM
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#5 |
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Prestige member Old Farts Club
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Location: Cleveland
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Re: RPO codes
1970 350 4 bbl TH 350 (or 375 ?) custom, P/S A/C P/B ,HD rear coils and factory step bumper, Sounds like they planed on towing somthing which would be funny for a powerglide and the gear indicator on the column is for a TH350 of course this could have been changed but people usually don't go through the trouble.
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06-07-2007, 07:43 PM
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#6 |
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Prestige member Old Farts Club
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Re: RPO codes
ttt
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06-07-2007, 08:53 PM
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#7 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
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Re: RPO codes
ok, i just looked in the books, an M 28 is a powerglide.
The only autos offered are the 350, 400 and powerglide... Are you sure it says 38... or could it be a 2? Are the letters COPO anywhere on your spid? |
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06-07-2007, 10:42 PM
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#8 |
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Senior Member
Join Date: Feb 2005
Location: Maynardville, Tn
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Re: RPO codes
FYI, a 375 is a 400 with a 350 output shaft. Length of ext housing is about 10 inches.
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SEMA Network- Protect our Hobby! 71 C30 in pieces, starting to come together. Click here for A Place For Tennessee Truck Enthusiest To Meet Last edited by woodridge; 06-07-2007 at 10:43 PM. |
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06-09-2007, 07:14 PM
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#9 |
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Prestige member Old Farts Club
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Location: Cleveland
Posts: 502
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Re: RPO codes
years ago I had a trans rebuilt under GM factory warranty and they are the ones that said they converted it to a 375 by installing 400 parts in the 350 , so I guess they were yanking my chain. It definitely has a " M ? 8 - 3 speed auto trans" no copo codes I guess its a mystery
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