factory option code help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sactoC10 · 11-17-2003, 12:29 PM

OK, I found a partial build sheet on the 1970 I started dismantling over the weekend. I don't have a book the tells me what these codes may mean, does anyone know?

F51 - H/D F&R ?
DG4 - W/C J ?
M38 - 3 ?

There are others, but not enough of the build sheet to figure out what they might be. Have to tell you this though. This truck has the G60 AUX/(helper) mono leaf springs in the rear,and they are very sleek and cool looking indeed! (gonna keep those)

OhioDan · 11-17-2003, 05:16 PM

I have some of the factory codes listed on my website. Check and see if they match what you have?

Longhorn Man · 11-18-2003, 01:05 AM

F51 - H/D F&R ?
DG4 - W/C J ?
M38 - 3 ?

Hmmm, the F51 H/D F&R...the F&R part means front and rear...HD is heavy duty...either looking at shocks or springs.
The DG4 will be the west coast jr mirrors.
No clue on the last one. I don't have my books here.

1969 GMC · 11-18-2003, 01:51 AM

arent all M prefixed RPO's for trannies? but i'm still not sure what M38 is.

1969 GMC · 11-18-2003, 01:59 AM

after a bit of sniffing on the web, it looks like i was sorta right.

the 3 should prolly be 3 speed automatic?

the rpo is for a TH350 from what I found

Longhorn Man · 11-18-2003, 02:01 AM

I dunno...I've had M49 stand for TH350.
Also TH400...I don't know if that was ever solved or not...

teamroper! · 11-18-2003, 11:51 PM

my parts book says that F51=front and rear shock absorbers
DG4=west coast mirror-jr stainless steel
but I couldn't locate to other one

Southpa · 11-19-2003, 12:05 AM

M38 = 2 speed automatic trans. - TH350
F51 = HD shock absorber equip - front and rear
DG4 = 6 X 11 West coast mirror - 2 sides

M49 = 3 speed automatic trans. - TH400

Longhorn Man · 11-19-2003, 12:17 AM

TH350 is a 3 speed...2 speed would be a powerglide.

bow-tie-bandit · 11-19-2003, 01:04 AM

I could not find the M38 rpo in 1970 but in 1969 it is listed as Transmission, 3 speed auto. Turbo Hydra-Matic for El Camino only. This is from Chevy truck ID Numbers 1946 - 1972 book.

sactoC10 · 11-19-2003, 01:25 AM

It does say M38, 3 spd tranny...

Southpa · 11-20-2003, 05:32 AM

I dunno, heres the list I got it from.

http://pictures.care2.com/view/2/930476606

Must be a typical GM typo,

.

11-17-2003, 12:29 PM	#1
sactoC10 71 DELUX Join Date: Sep 2003 Location: Northern CA / Sac Posts: 1,056	factory option code help OK, I found a partial build sheet on the 1970 I started dismantling over the weekend. I don't have a book the tells me what these codes may mean, does anyone know? F51 - H/D F&R ? DG4 - W/C J ? M38 - 3 ? There are others, but not enough of the build sheet to figure out what they might be. Have to tell you this though. This truck has the G60 AUX/(helper) mono leaf springs in the rear,and they are very sleek and cool looking indeed! (gonna keep those)

11-17-2003, 05:16 PM	#2
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	I have some of the factory codes listed on my website. Check and see if they match what you have? __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.

11-18-2003, 01:51 AM	#4
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	arent all M prefixed RPO's for trannies? but i'm still not sure what M38 is. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

11-18-2003, 01:59 AM	#5
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	after a bit of sniffing on the web, it looks like i was sorta right. the 3 should prolly be 3 speed automatic? the rpo is for a TH350 from what I found __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

11-19-2003, 12:05 AM	#8
Southpa Registered User Join Date: May 2000 Location: Victoria, BC, Canada Posts: 2,410	M38 = 2 speed automatic trans. - TH350 F51 = HD shock absorber equip - front and rear DG4 = 6 X 11 West coast mirror - 2 sides M49 = 3 speed automatic trans. - TH400 __________________ 1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first.

11-18-2003, 01:05 AM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	F51 - H/D F&R ? DG4 - W/C J ? M38 - 3 ? Hmmm, the F51 H/D F&R...the F&R part means front and rear...HD is heavy duty...either looking at shocks or springs. The DG4 will be the west coast jr mirrors. No clue on the last one. I don't have my books here.

11-18-2003, 02:01 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	I dunno...I've had M49 stand for TH350. Also TH400...I don't know if that was ever solved or not...

11-18-2003, 11:51 PM	#7
teamroper! Registered User Join Date: Nov 2003 Location: northeast alabama Posts: 256	my parts book says that F51=front and rear shock absorbers DG4=west coast mirror-jr stainless steel but I couldn't locate to other one

11-19-2003, 12:17 AM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	TH350 is a 3 speed...2 speed would be a powerglide.

11-19-2003, 01:04 AM	#10
bow-tie-bandit Live life and be happy. Join Date: May 2003 Location: Spokane,Washington Posts: 266	I could not find the M38 rpo in 1970 but in 1969 it is listed as Transmission, 3 speed auto. Turbo Hydra-Matic for El Camino only. This is from Chevy truck ID Numbers 1946 - 1972 book. __________________

11-19-2003, 01:25 AM	#11
sactoC10 71 DELUX Join Date: Sep 2003 Location: Northern CA / Sac Posts: 1,056	thanks It does say M38, 3 spd tranny...

11-20-2003, 05:32 AM	#12
Southpa Registered User Join Date: May 2000 Location: Victoria, BC, Canada Posts: 2,410	I dunno, heres the list I got it from. http://pictures.care2.com/view/2/930476606 Must be a typical GM typo, . __________________ 1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first. Last edited by Southpa; 11-20-2003 at 05:38 AM.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.