1984 gmc - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Already Gone** · 03-06-2014, 09:49 PM

I have a chance to bid on this 1984 GMC long box that has only 65000 original miles. It has a 305 with a 3 speed auto trans ( what year did the 4 speed autos come out ) and 2:73 gears. It also has A/C, C/C and tilt. If my memory serves me right 305's of that era had cam problems with the lobes going round, does anyone agree? I would like to keep this truck long term so if anyone has any suggestions to potential problems please let me know. Is there anything else I should check into on the truck? Any opinions on value would be appreciated. Attached is the only pic I have.

TwoFiftyShifter · 03-06-2014, 10:32 PM

I've got an 84 K10 with its original 305. 104,000 miles, runs great.

manimal · 03-07-2014, 10:15 AM

Hey Greg! Nice truck!
When I worked in the machine shop, we never saw 305's come in for flat cams. The bottom ends were fairly stout. It's the heads that will give you grief. They are very thin wall casting heads and crack easily. We use to sell a LOT of World Products S/R Torquer 305 heads to customers with those engines.

**Already Gone** · 03-07-2014, 10:59 AM

Quote:

Originally Posted by manimal

Hey Greg! Nice truck!
When I worked in the machine shop, we never saw 305's come in for flat cams. The bottom ends were fairly stout. It's the heads that will give you grief. They are very thin wall casting heads and crack easily. We use to sell a LOT of World Products S/R Torquer 305 heads to customers with those engines.

Thanks for the info Lance. I'm going to call the owner today and get some detailed info. I believe he bought it new and from the pic it looks like it is decent shape.

Rubble · 03-07-2014, 11:21 AM

That's a nice truck! Hard to find a low mileage one that nice up here anymore.I'm pretty sure the 700R came out in 81.

**Already Gone** · 03-07-2014, 11:33 AM

Quote:

Originally Posted by Rubble

That's a nice truck! Hard to find a low mileage one that nice up here anymore.I'm pretty sure the 700R came out in 81.

Maybe you had to get the 350 or have rear gears lower than the 2:73's this one has to get a 4 speed automatic.

kody · 03-07-2014, 01:16 PM

bought mine new in 1984,same 305 has over two hundred thousand mi.

**Already Gone** · 03-07-2014, 01:53 PM

Quote:

Originally Posted by kody

bought mine new in 1984,same 305 has over two hundred thousand mi.

and have you had any major issues or rebuilds as yours is the type of info I am looking for.

*nekkidhillbilly* · 03-07-2014, 02:02 PM

the 84 parts truck i had was oem 700r4 305

kody · 03-07-2014, 04:49 PM

just starter,water pump,and fuel pump. engine never been touched.

**Already Gone** · 03-07-2014, 05:38 PM

Quote:

Originally Posted by kody

just starter,water pump,and fuel pump. engine never been touched.

Thanks and those items should have been replaced over the years with 200k on the truck.

cadillac_al · 03-08-2014, 08:01 AM

305's run forever. A lot of people would balk at the 2.73's but if you have to do some work off road, that's what low range is for. I think that truck would easily be $2-3k around here.

**Already Gone** · 03-08-2014, 08:05 AM

Quote:

Originally Posted by cadillac_al

305's run forever. A lot of people would balk at the 2.73's but if you have to do some work off road, that's what low range is for. I think that truck would easily be $2-3k around here.

I 'll be quite happy if I can get it in that price range.

03-06-2014, 09:49 PM	#1
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,105	1984 gmc I have a chance to bid on this 1984 GMC long box that has only 65000 original miles. It has a 305 with a 3 speed auto trans ( what year did the 4 speed autos come out ) and 2:73 gears. It also has A/C, C/C and tilt. If my memory serves me right 305's of that era had cam problems with the lobes going round, does anyone agree? I would like to keep this truck long term so if anyone has any suggestions to potential problems please let me know. Is there anything else I should check into on the truck? Any opinions on value would be appreciated. Attached is the only pic I have. Attached Images __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

03-06-2014, 10:32 PM	#2
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: 1984 gmc I've got an 84 K10 with its original 305. 104,000 miles, runs great. __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

03-07-2014, 10:15 AM	#3
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: 1984 gmc Hey Greg! Nice truck! When I worked in the machine shop, we never saw 305's come in for flat cams. The bottom ends were fairly stout. It's the heads that will give you grief. They are very thin wall casting heads and crack easily. We use to sell a LOT of World Products S/R Torquer 305 heads to customers with those engines. __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

03-07-2014, 11:21 AM	#5
Rubble Registered User Join Date: Feb 2012 Location: Big Valley. Alberta Posts: 674	Re: 1984 gmc That's a nice truck! Hard to find a low mileage one that nice up here anymore.I'm pretty sure the 700R came out in 81. __________________ 1977 Chev C30 454/465/14ff DRW 1974 Chev C20.350/465/14ff " Rock n Roll ain't noise pollution"

03-07-2014, 01:16 PM	#7
kody Registered User Join Date: Mar 2011 Location: durham nc Posts: 105	Re: 1984 gmc bought mine new in 1984,same 305 has over two hundred thousand mi.

03-07-2014, 02:02 PM	#9
nekkidhillbilly Account Suspended Join Date: Apr 2009 Location: hazard, ky Posts: 1,674	Re: 1984 gmc the 84 parts truck i had was oem 700r4 305

03-07-2014, 04:49 PM	#10
kody Registered User Join Date: Mar 2011 Location: durham nc Posts: 105	Re: 1984 gmc just starter,water pump,and fuel pump. engine never been touched.

03-08-2014, 08:01 AM	#12
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,354	Re: 1984 gmc 305's run forever. A lot of people would balk at the 2.73's but if you have to do some work off road, that's what low range is for. I think that truck would easily be $2-3k around here. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10



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