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Fitment of new Tremec TKX

Flchallenger

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Has anyone installed one of the newer TKX 5 speeds. Did you have to enlarge the tunnel? Is it much smaller than the TKO's. I am considering installing one.
 

Bstoker87

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Got mine fit going from auto to manual using a AMD 4 speed tunnel, fits with plenty of room.

Also should mention a stock TKX will not work, I'm using a SST TKX.
 

moparlifer

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Yes, agreed.
I just ordered and received mine from SST.
They machine the case to make them fit and then pressure check it to make sure nothing leaks.
Glad to gear it fits the stock tunnel!
I'm going to test fit mine in a few weeks.
 

Flchallenger

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Well I got it in and I can't get the tail end to go any higher than the tkx. that was in it. Shifts alot better though. However it vibrates worses than the tko when just crusing at 70 mph. When you floor rattles like crazy. Can anyone recommend someone that can set this thing correctly. I have been fighting this for 15 years when I put the first tko in it. I got leaf spring rear end with cal trac ladder bars to keep the pinion from moving and changing. got a high dollar driveshaft with a cvc joint instead of a u joint. Have had probably 6 different people work on it with virtually no change. changed pinion angles to no avail. 150 k and still can't drive it.
 

Flchallenger

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I was under the impression I would be able to get the tail of this up to create a better angle for the drive shaft. Also the center link rubs on the oil pan. Finally just had a channel welded into the oiil pan to give it room.
 

Bstoker87

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My Uncles put a TKO kit in their 1970 Challenger and they had to put spacers in to lift the back of the trans to get the vibration to go away.
 

moparlifer

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My Uncles put a TKO kit in their 1970 Challenger and they had to put spacers in to lift the back of the trans to get the vibration to go away.
Sorry to hear of your issues. I read in some of the literature that the engine and tranny are supposed to be 2 degrees down from horizontal in back and the pinion angle 2 degrees down in front.
I also saw a chart somewhere that specs the center of the Crankshaft to the top of the K-frame is supposed to be 5-1/2 inchs with a gen 3 hemi likely the same with a early V-8. My K-frame and motor mounts had to be convinced they wanted to get there (to the 5-1/2 inch distance.
Also-check to ensure that you are using a V-8 k-frame-as the 6-cylinder and gen 2 hemi K-frame wont be correct.
I have my original K-frame and one i got from a swap meet and the angle of the idler arm mount is different between them. the one that is different has a welded tag that has 72 stamped in big letters.
Just saying if you don't know for absolute certain what the k-frame came off of it could be the issue with the idler arm hitting the Oil pan and maybe the driveline angle.
 

Flchallenger

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K frame is now a QA1 tubular. I had the car painted and the frame was bent some, all new fenders, inners in the rear, roof, trunk floor pan and k frame. Long story short, I put the TKO in around 12 years ago replacing a automatic. Since then vibrated, multiple drive shafts. Replace rear end with a Strange 60 with 390 gears. All new suspension. 512 stroker motor. Just replaced the clutches with a dual disc, flywheel and had them balanced together. This car was featured in hotrod magazine article on fixing unfixable problems. When I was having it painted and body work done they got a drive shaft builder for Nascar cars come in and look at it. He built a new drive shaft with a cvc joint on the end to tranny. This has helped some but not much. He supposedly looked at all the angles. So you would think it thats not the problem the angle because he says with the cvc angle not a issue. I am thinking maybe it's the rear end. It was added at the same time as the trans.
 

fasjac

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Has anyone installed one of the newer TKX 5 speeds. Did you have to enlarge the tunnel? Is it much smaller than the TKO's. I am considering installing one.
I put a TKO in my 73 Cuda in 2009, mine was already manual and did not have to modify the tunnel at all.
I thought the TKX might a bit larger but, you’ll have modify your tunnel anyway.
A great upgrade though. Good luck, mine was easy.
 

fasjac

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I was under the impression I would be able to get the tail of this up to create a better angle for the drive shaft. Also the center link rubs on the oil pan. Finally just had a channel welded into the oiil pan to give it room.
Mine is stock k-member and stock motor mounts, using a Milidon oil pan with no issues rubbing. I haven’t read every post but, dial indicating the bell housing is a must. If you did not.
 

Drivun

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Disappointed to hear thx doesn’t go higher than the TKO. Engine/tranny drop at rear prevented me from running TTI full length headers due to lost ground clearance.TTI shorties we’re better with a depth of only one head pipe vs two deep on the 4 tube. Guess I need further custom exhaust work to get lower ride height and still have speed bump clearance.
 
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