| Re: [GMCnet] 1970 Tiara with Toronado FWD Question about power train [message #344724] |
Mon, 01 July 2019 13:41  |
rallymaster
Messages: 662
Registered: February 2004
Location: North Plains, ORYGUN
Karma:
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Senior Member |
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Jim Kanomata in Newark, CA has replacement final drive units as low as
4.10:1.
https://www.gmcrvparts.com/category-s/149.htm
Applied GMC -
38424 Cedar Blvd Newark, CA 94560
Phone: 800-752-7502
Email: mail@appliedairfilters.com
RonC
On Mon, 01 Jul 2019 12:09:54 -0600 Matt Colie via Gmclist
writes:
> Rick Daley wrote on Mon, 01 July 2019 01:15
>> I have a 1970 Ultravan Tiara. It uses the same Toronado drive
> train that the GMC motorhomes use. My mechanic tells me the engine
> is in good
>> shape. The low cylinder shows 145 and the high cylinder shows 154
> in a recent compression check. My rig weighs 8,000 lbs which is
> heavy for a
>> Tiara. They were delivered at 6,500 lbs.
>>
>> I understand the 23 foot GMC motor home weighs 10,000 lbs and the
> 26 footer 12,000 lbs give or take a few lbs.
>>
>> I recently crawled over the Cascades on Washington Hwy 20 east and
> was routinely down to 20 mph with the vacuum gauge in the deep red.
> If my rig
>> weighed 12,000 lbs I am pretty sure I would still be on the other
> side of the Cascades.
>>
>> Can anyone give me some recommendations or some threads to pull on
> improving my rigs climbing performance? (I don't have a problem
> doing 70 on
>> the flat but usually keep it at 65 or below).
>>
>> Regards,
>>
>> Rick Daley
>
> Rick,
>
> The Ultravans that I have seen that were 455 were all fit with power
> directly removed from a Toronado. Most of the standard package had
> a 2.73 final
> drive, but the 3.07 (what was shipped in TZE) was from the trailer
> tow package, and it was wrong for the TZE that day. There are
> better available
> now.
>
> We have a 9460# 23' coach, and we crossed the Big Horn (the GPS
> reported 9200msl) on the way to Yellowstone with out any real
> issues. I expect any
> naturally aspirated engine to have not put out full power over
> 8000MSL.
>
> I fully agree that you may not be getting the secondaries open.
> When we open ours, the racket is unmistakable. If the carburetor is
> still the stock
> Rochester, then the secondaries are mechanical link. You can have
> someone step on the throttle and see if they do open fully. (The
> actual throttle,
> not the air valve.) If not, fix that before you do anything else.
>
> If you ever have to do engine work, we have people that can provide
> some important guidance.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
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Ron & Linda Clark
North Plains, ORYGUN
1978 Eleganza II
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Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II
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