Auxiliary Gas Tank 1971 Chevy K20, 3/4-ton 4wd

First the HO72 is common to find in a 3/4 ton of the era with a 4
speed SM465 so it is still a 3/4 ton. (I had a 66 3/4 ton with a 6 and
a 4speed than had the HO72 in it too) Also internally the 52 and 72
are same axle except for a adjustable  ring gear thrust pad.

On the fuel tank, It was possible to get uo to two aux tanks from
factory back then. I had a 72 3/4 ton 4x4 same drive train (except
spicer axles and lockout hubs because it was a GMC and they came with
spicers back then) and with one aux tank from factory and drove it for
10 years and loved the dual tank setup a lot. They mounted in bed
fenderwell between wheel well and front of bed and had a filler
through side of bed from factory with a manual valve on floor between
seat and door and a switch on dashboard to select which tank to read
from. The aux tanks held about 16 gallons each  
-----------------
TheSnoMan.com

Mon, 16 Oct 2006 02:42:54 GMT in alt.autos.classic-trucks SnoMan
|
|>
|> Hi,
|>Want to buy and install another gas tank under the bed of this
|>truck.  Where can I buy one.  Have spent hours searching the net
|>in all the usual places and more...  All I find is for late
|>models.
|>
|>Some have told me I have a 1-ton.  Who can tell me if the 3/4-ton
|>and 1-ton have the same frame?  I know the read diff is 1-ton,
|>but the truck was sold to me as a 3/4 and the VIN is to a 3/4.
|> Thanks,
|>
|> Vic
|>
|>-----------------------------------------------------------------
|>  1971 Chevrolet K20
|>  3/4 ton pickup
|>  Fleetside long bed
|>  4WD
|>  350
|>  4 on the floor
|>  Transmission  - Muncie 465      
|>  Transfer case - New Process 205
|>  Warn manual hubs
|>  Front Diff    - Dana 44        
|>  Rear Diff     - Eaton H070      
|>           should be an H052 for 3/4-ton,
|>                        H072 for 1-ton.
|>           current diff is a 1-ton from a 1965 truck.
|
|
| First the HO72 is common to find in a 3/4 ton of the era with a 4
| speed SM465 so it is still a 3/4 ton. (I had a 66 3/4 ton with a 6 and
| a 4speed than had the HO72 in it too) Also internally the 52 and 72
| are same axle except for a adjustable  ring gear thrust pad.
|
| On the fuel tank, It was possible to get uo to two aux tanks from
| factory back then. I had a 72 3/4 ton 4x4 same drive train (except
| spicer axles and lockout hubs because it was a GMC and they came with
| spicers back then) and with one aux tank from factory and drove it for
| 10 years and loved the dual tank setup a lot. They mounted in bed
| fenderwell between wheel well and front of bed and had a filler
| through side of bed from factory with a manual valve on floor between
| seat and door and a switch on dashboard to select which tank to read
| from. The aux tanks held about 16 gallons each  


Read it again, it has an H070.

Yes, I know they came with back in the day.
Where can I get one now?

 Thanks,

 Vic

There was no HO70 per say, only a HO52 and HO72. There was a few D70's
used in some trucks in 70's (D70's were used on some 1 ton models and
may have made it into a few 3/4 tons)


Bone yard unless you can still get them through a GM dealer at a high
cost. They were optioned on 67 to 72 models and after that they had a
different aux tank option for a bit. Besides having them myself I have
seen other old trucks with them from time to time. Years ago I knew a
guy that had the little known "longHorn" ( a GM P/U with a 8 foot 8
inch bed made only a few years in the metioned body style) and it had
aux tanks too from factory too.I remember when GM used to offer 20 and
30 gallon tanks as options on blazers and a 40 gallon option on
suburbans. (I have one) You could adapt one of these 20.30 or 40
gallon tanks to your truck (they were offered through 91 on burbs and
blazers) if you relocated the spare tire and its rack as it would
basically be a bolt it of sorts.
-----------------
TheSnoMan.com

Just watched "Trucks" on TV on Saturday and they are working on
"Project Copperhead" which is a truck of that vintage.  Was installing
a new aluminum gas tank between the frame rails and behind the rear
end.

Ever notice how that guy has no dirt on his hands and just goes and
buys any old thing he can think of and bolts it on?  Wonder if he can
work on a real truck or just assemble new parts?
-
Regards
Gordie