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Old 08-19-2016, 05:19 PM   #15
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Hate to be all pessimistic and all but i don't see this as working out well. Sounds like your rig will be overtaxed just about all the way around.
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Old 08-20-2016, 02:08 AM   #16
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A quick update after driving 150 miles.

We went about 55mph for most of the way and about 10miles in stop and go traffic.

The suburban was only hooked up for the first 5 miles because I couldn't get the lights working properly due a bad ground in the RV somewhere.

There were 2 sections of interstate about 6 miles each I was going 70-80mph according to GPS.

Our final mpg average was 6.8-7.5

All miles were logged via GPS.

I idled for a few hours while tuning the engine so I deducted 2 gallons for that..

This was with timing unknown and no vac advance on 87 Oct 10% corn. I can probably gain 1-2mpg once timing is set and maybe regear to 3.73. there is so much tq with 4.10's that even fully loaded at 9500+ lbs I can lift the front end atleast 5 inches if I punch it.

Engine was turning 2400RPM at 55MPH and 3000rpm when at full interstate speed.
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Old 08-20-2016, 07:32 AM   #17
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Hi MudiGGer25,

Sorry for a late response. It appears you have the transmission temperature issue covered. Looking at your frame extension pictures, the transverse "box" looks like what I remember from our Midas Mini, but your frame extensions appear to have substantial flanges. If my memory is correct, I think ours looked like the extensions were continuous - which of course were not. My experience was a long time ago, but I remember that our brand new Midas had instructions that it was not suitable for towing, but also had a hole for a hitch ball in the middle of the step in the rear bumper. So, of course, I bought a car trailer and began towing it. I don't think we had excessive tongue weight. For your situation, reviewing the frame extensions and eventually reinforcing sounds like a good idea.

Going way back to your original post, and the gas tank capacity, I remember that our GM chassis had a 36 gallon tank.

Quote:
Originally Posted by MudiGGer25 View Post
Oh yes, i know all about the hot transmission temperatures, it has to do with all the TC slippage moving such a large amount of weight with such a underpowered (for the time) 400ci. I always add the largest aux cooler i can get my fingers on, usually a 26,000GVWR .....

I have attached pictures of the frame "extension" on this model, i cannot recall what it looked like on the midas we owned though. I do say that the arms are quite heft on this fleetwood model, and in my experience fleetwood usually doesnt cut many corners on most models, where as no-name manufacturers will do anything to make a few extra bucks imo.'


Let me know if that looks like what you had,I will be re-inforcing it anyway but flat towing for the time being has less than 75lbs of tongue weight.

I would say with the hitch setup currently i would not exceed 5,000lbs anyway since it is only a 2" ball, but it can easily be reinforced to support the capactiy of a 2 5/16" ball, provided that i keep the tongue weight reasonable
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Old 08-20-2016, 11:23 AM   #18
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Quote:
Originally Posted by George Schweikle View Post
Hi MudiGGer25,

Sorry for a late response. It appears you have the transmission temperature issue covered. Looking at your frame extension pictures, the transverse "box" looks like what I remember from our Midas Mini, but your frame extensions appear to have substantial flanges. If my memory is correct, I think ours looked like the extensions were continuous - which of course were not. My experience was a long time ago, but I remember that our brand new Midas had instructions that it was not suitable for towing, but also had a hole for a hitch ball in the middle of the step in the rear bumper. So, of course, I bought a car trailer and began towing it. I don't think we had excessive tongue weight. For your situation, reviewing the frame extensions and eventually reinforcing sounds like a good idea.

Going way back to your original post, and the gas tank capacity, I remember that our GM chassis had a 36 gallon tank.

Thanks for replying. i did not get the trans cooler installed since we sold the house alot sooner than we had planned so we had to throw everything in and leave about 2 weeks early but i will be getting the electrical engine temp gauge and the mechanical temp guage connected to the trans return line so i can see both temps.

I put $50 in (about 23 gallons up here with current prices and it put me on the 3/4 mark so i would say a 31-36 gallon tank would be about right... I intend to add on a aux tank from a farm truck or dual tank pickup if i can find one out in the local scrap yard, just for the extra capacity.


I should be getting a cheap mig welder around the first of next month and be able to re-inforce the hitch and weld the exhaust leaks ( it was ungodly loud lol, and the dog house wouldn't close bc i havent finished the trimming for the 454 lol )



it towed very well considering i was actually going 65-75mph when the speedo only said 45-50mph


Stopping was no issue either lol. but i think the suburban weighs alot more than the 5000 the tow bar is rated for lol

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Old 09-03-2016, 07:58 PM   #19
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quick update to close off this thread, we got 6.9-7.5ish MPH average going 55 for about 100 miles and going 75 for the other 50 miles, so probably close to 8mpg if i stayed 55mph with the rig in tow... the speedometer only says 50mph when i am really going 75mph so we disconnected the toad to verify the speed using the engine RPM instead.

I have a line on a 1994 350TBI/4l80eHD that i will be buying in about 4 weeks and will be swapping into the RV on the same day, its currently in a 1996 boxvan (uhaul type) rated for 18,000GVW. same gear ratios as i have now but adding a .75 OD, and upgraded internals. the box van was getting 14-16mpg unloaded (7,000lbs) on a daily basis, but with my setup i will be happy to see 9-10mpg once complete.


I will start a new thread once the engine is installed and running to show mpg numbers and how well it does or does not fit inside the 1979 chassis.
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