99xcss4
92g-94c frank'n (truburban) K-2500
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Good dude, fell on hard times under Obama policies with his work.
Correct. The L31 in the boat I had a few years ago ran 3,500+ the whole time it was on plane and had something like 2500 hours on it. Sometimes as much as 5,000 rpm for fairly long periods of times. Same everything as the truck engine except for the camshaft and intake manifold. Every SBC before OD transmissions turned 3K at 70 mph for hours on end. The L31 in my 1987 G20 van spins 3K @ 85 mph.So just to recap:
1) Towing in OD with this rig is not really reccomended because even with the trailer empty any fuel savings would be minor / barley noteworthy and would increase the ods of having an trouble free trip ( even if running at 2500 - 3000 rpm constantly )
2) Towing with this rig in 3rd gear at highway speeds ( even when I get it loaded with another pick up ) would not cause any other concerns that would not already be present with a vehicle of this age and 160K on the clock.
Is this correct ?
^^^ This.@name, if you're towing a GMT400 with a '94 K1500 4L60e, your larger issue will be brakes.
Should have JB6 brakes just like the G-vans I have had. 11 x 2.75" rear drums, larger front caliper pistons, double vacuum booster. In properly maintained state they work extremely well if not a little prone to excessive rear lockup. With weight on the rear that tendency seems to diminish. Definitely want trailer brakes either surge or electric with a good controller like a Podigy. My 99 Tahoe had the same brake system. I later added hydroboost, the matching master, and the even larger Police/8800 GVW SRW 3500 front calipers to it. Tahoe was fine as it was but I wanted braking equal to the performance of the 8100 under the hood.^^^ This.
Check your rear brakes. AFAIK all Suburbans got 11" drums, but...
See if yours has 10" drums; if so, open them up and check their adjustment b/c the 10" drums rarely stay properly adjusted.
Even if 11", you might want take a good look a them.