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| Re: Opinions Wanted on Transmission Filter [message #366082 is a reply to message #366078] |
Thu, 12 August 2021 11:30  |
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Messages: 348
Registered: August 2015
Location: DFW
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Larry wrote on Wed, 11 August 2021 22:46When you get a chance, read this article. Go to :
https://www.gmcmi.com
Upper right corner click on "READ HERE Magazines and newsletters"
Scroll down to "The Summer 2020 issue 152 of GMC Vintage RVing"
Lower Right of that issue, hit "Fullscreen"
Using right arrow, turn pages to P.29 for article on "Upgrading Transmission Cooler Lines"
Lower right of screen is "Exit" button.
HTH
Thanks Larry... Yes, I had seen this article and I did upsize the transmission cooler lines at the same time... I also plumbed in an auxiliary cooler while I was at it, as I tow a Wrangler on some trips.... (Actually, the PO had bypassed the factory cooler and I only had a rather large air to oil cooler, but I replaced my radiator a few years back and had planned on re-incorporating the factory cooler to work with the existing aux cooler)
I had initially planned to use hard line... But I found it difficult to work with under the coach, and was not happy with the bends and layout I was getting... If I was doing a full resto with the front frame section removed, I think I would have been more successful...
I ended up going with -6 AN line... Interestingly, I ran into a similar problem to the one mentioned with the adapter fittings in that GMCMI newsletter article. Suprisingly (at least to me) standard AN fittings actually neck down quite a bit... I did not put a caliper on them, but especially the 90s looked to be the same ID as a 5/16' line or even a little smaller... I tried several brands of AN fittings as well. Some were better than others, (Russell I think had the largest ID of the fittings I looked it) but none were satisfactory, as with the cost and effort of upgrading, you would want a full size 3/8" line all the way through.
What I ended up going with was the Aeroquip PTFE hose and fitting system. The fittings for this hose appeared to be the same ID as the ID on 3/8 hard line... Here's a photo showing 2 Aeroquip -6AN fittings... Standard AN fitting on the right, and the PTFE fitting on the left... (For some reason it uploaded to the photo site distorted, but you can still see the difference between the standard and AN inside diamater) Again, both are the same -6 (3/8ths) size:
http://www.gmcmhphotos.com/photos/mechanical/p68314-ptfe-fitting-vs-standard-an.html
Was very pleased with the PTFE fittings vs standard AN... They were very easy to work with (Assembling fittings was much easier than standard AN line) and the fittings are actually a coated steel, which keeps the cost down somewhat and they are very durable. Also, the PTFE line has a long lifespan, and, as PTFE is low friction, it is even supposed to promote flow to some extent as the trans fluid is naturally repelled by the PTFE. Aeroquip even has the necessary fittings to go straight from the -6 hose to the 5/8-18 inverted flare fittings on the trans cooler.
As suggested by some other owners on this site, I ended up routing the outlet hose over to the passenger side, ran the hot fluid through the filter, from there to the radiator cooler, then out of the radiator cooler to the aux cooler (on the drivers side) then out of the aux cooler, down the drivers side to the return on the transmission. Used about 20 feet of hose, all in... Without the aux cooler you would probably have less line and of course fewer fittings.
This is the line and fitting system I went with:
https://www.jegs.com/p/Aeroquip/Aeroquip-PTFE-Racing-Hoses/3629195/10002/-1#
Think I had around $200 all in for the fittings and hose evenly split between the 2... Without an aux cooler and the aux filter, you'd save on a few fittings, and be at $150-175 I would guess....
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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