The 4t80 shoehorn

TurboGTU · May 13, 2009, 03:23:25 PM

Yea, so after some time off from work at the truck shop... I started working on the TGP. I'm so far into it that theres no going back to the 4t60s. About to do some cutting on the engine cradle. It looks stright foward. Still need to center it to the cv axles. PMIII seems like it will only work with it. Too little room for the vacume booster. So I found a 90s Jaguar XJ6 brake accumulator to use on it. Not a perfect lenth where it screws in..but it works. Just enough threds. Just need to take apart and reseal my PMIII. See what I can rebuild on it. If not...off to adapt another unit like it or search for a soso PMIII.

TGed · May 13, 2009, 03:31:37 PM

Cool, progress pics are a must!

Serge A. Storms · May 13, 2009, 04:13:39 PM

Quote from: TGed on May 13, 2009, 03:31:37 PM
Cool, progress pics are a must!

X2!

TGed · May 13, 2009, 05:00:00 PM

I wonder if the 4t80 will fit in a Beretta?

If you find out the main physical obstacle please let me know so I can cogitate a method around it.

TurboGTU · May 13, 2009, 07:49:59 PM

4t80 is overkill for a beretta... let alone will even clear the firewall mounted rack setup. Save for a 4t65. 2600lbs vs the TGP 3500lbs give or take.

Will get those pics.

The CV ends to the hubs is a little diffent. They physicly fit but they don't have the ABS rings and a step on them. Mine were from a 95 Olds Aurora, maybe caddy are diffent. Tried swapping ends from the TGPs but the 80es axles are beefier at the end. And tried using the sphireical guts into them..but GP are larger...that don't make sence. Oh well. No ABS so it looks. Worst 3hrs spent...nasty shit everywhere.

Just need to cut where the starter area is at by the tranny to clear the engine craddle and by the drivers side ...its a fat ass. Was going to cut..but the CVs stole the day. Pontiac Jeff did this to a larger Bonie. So I said...It should work on this wide track TGP. :icon_rolleyes: . Father still has doubts.

TGed · May 13, 2009, 09:53:30 PM

It may be over kill, but I am sick and tired of not finding a 3 speed trans capable (at a reasonable price) of handling power/tq and a 4t60 is going to net me same reasoning/problems. Ideally if there were a 3T80 ever built that would bolt up (like the 4T80) and play right, I'd rather do that instead.

Are you using a 4T80 or 4T80E?

You are aware of the rear bolt that needs to be tapped and the ears need to be hacked up for this swap? Also, in order to retain A/C you will need to alter the mounting system a little using a H/L body style front mount and posibly still cutting the front frame crossmember.

I will probably look into this for the beretta still, if the cost stays affordable and I feel like making something of it I might just do it. Will not be the first or last experiment(s) that I have done and it might work too (like some have) .

Serge A. Storms · May 13, 2009, 10:00:50 PM

Quote from: TGed on May 13, 2009, 09:53:30 PM
It may be over kill, but I am sick and tired of not finding a 3 speed trans capable

An old article that I read said that there were 50 AWD 6000 STEs built with the LG5 3.1T. The article (as I recall, it's been a really long time) also said that the transmissions (TH125 with transfer case) held up to the turbo V6.

TGed · May 13, 2009, 10:09:10 PM

Do you know there power output goal? 400wtq and 375wHP is the goal. Also you have to remember the rarity for the parts THEY may have used might not be very easily accessible for public people, especially nowadays.

TurboGTU · May 14, 2009, 02:23:03 PM

Not nice pics..but you get what u paid for.. :laugh:

U can see where I notched the engine for the tranny. Still need to drill a hole and weld a nut on it. Might drill out the other holes on the tranny because two are coved up. Already drilled the flywheel for the converter. The cradle is not cut yet.

TGed · May 14, 2009, 04:06:53 PM

Could you measure this for me please?

TurboGTU · May 14, 2009, 08:31:54 PM

Its all cut up now. I still need to weld the rear mount for the trans or make it hang like the olds had it on the frame rail. ALso need to weld to reinforce the cradle. If I don't like that, I might just snag a caddy cradle and adapt it to the TGP.

The trans isn't that much fatter from the bell housing to the rear pan..its just thick from top to bottom unlike the 4t60s where it slims down from the bottom to clear the trans mount and cradle. Will get those messurements.

mfewtrail · May 14, 2009, 08:49:37 PM

That 4T80 is a monster! What made you choose the 80 over the 65-E? I know it's stronger, but the 65-E can be built to handle just about anything you can throw at it...

EDIT: About that Jaguar accumulator...What are those pre-charged to? Our stock accumulators are pre-charged to 1200psi and that's increased to between 2200-2700psi for braking. I've seen "1500psi" ratings for the Jaguar accumulator, but I'm not sure if that was the pre-charge pressure or working pressure.

TurboGTU · May 15, 2009, 11:05:33 AM

Right now I don't have 2grand to spend on the 65e I have. And then worry if the Diffential will hold and the CV axles will hold. Thise axles make the TGP units look like pencils at the tranny end.

I don't know about the accumulator. If it works it works. THe pressure switch will shut it off when it gets to the pressure anyway. We will see what happens.

TurboGTU · May 15, 2009, 11:22:05 AM

TGed...its 11in. Fatter end is 13in but that clears the fender wall and the craddle. The 4t60-e I had is 10 1/2. So you can figurer out how big it is back there.

TGed · May 15, 2009, 11:50:47 AM

Thank you TurboGTU. Going out to measure it in a few. Hope it clears.

Edit: Roughly it looks like it will fit.

PS: What vehicle line up has the 4T80 NON E? I searched the interwebz with poor results. 1992 Cad Alante'?