High Sierra 2500 info

[Frijolito1988]

Hey guys, we have a 83 high Sierra 2500 , 8 lug , v8 truck, that i am thiking of yanking the V8 out of.

Did these come with 350 or could it possibly even be a 305 ? Also how could i check what type of tranny it has ? It looks bigger than my TH350 so i am thinking TH400 ?

Vin is 1gtgc24m8ds510685

[Keith Seymore]

There's a couple ways to get at this:

First, your VIN:

1 = US built
G = GM
T = GMC truck
G = brake system
C = reg cab 2wd
2 = 20 series 3/4 ton
4 = regular cab
M = 5.7 L V8
8 = check digit
D = model year = 83
S = St Louis assembly plant
5 = GMC
10685 = sequence nunmber

So - it's a 5.7, with a TH400 trans (if the non-overdrive trans was selected; MXO = overdrive vs MX1 = non).

Secondly, here is the GM Heritage Center info pack, which will explain (in general) all of the RPOs that were available for your truck:

http://www.gmheritagecenter.com/gm-h...olet-Truck.pdf

Powertrain chart is shown on page 15.

Lastly, if you want to spend $50 you can send your VIN to the Heritage Center and they will send your original invoice, which includes the RPO content and pricing for your specific truck.

http://www.gmmediaarchive.com/

K

[Frijolito1988]

Thanks!! Really appreciate it.

what is the main difference between the 350/400 tranny ? The TH400 is just beefier ?

[JRANGER]

cool....I believe my High Sierra 1500 came out of the St Louis plant too lol

[Keith Seymore]

Originally Posted by Frijolito1988

Thanks!! Really appreciate it.

what is the main difference between the 350/400 tranny ? The TH400 is just beefier ?

Yes.

They are a different case (ie, modulator in different location, etc) but the TH400 is heavier duty.

K