He also has a T5 out of a 80's Datsun 280, not sure how the gear ratios are set.

 

LOL, this made me laugh.



IMO the only reason you would use a double O would be if you had a 4:1 or lower (numerically higher) ring and pinion. which is exactly why theyre using them in modern 4 bangers and big V8 cars.

 

So True, but, it's just wrong to use a double overdrive tranny with the stock XJS 2.88 diff. With such gearing, 6th gear is basically useless, and one will need to downshift to 4th in order to have any kind of aggressive acceleration at highway speeds (i.e. as when passing another car). Even with my 3.54 diff, I would be very hesitant to use a double overdrive transmission, such as a Tremec 6-speed.

That's just my opinion though.

 

I was nearly there anyway but this last post has made my mind up to forget the T-56 & go with a TKO. Now the question is 500 or 600 & standard ratios or close ratios, stick with the 3.54 diff or go to a 2.88 diff?

I've put together a spreadsheet with the relevant information showing engine speeds with the various ratios etc etc. is there anyone who'd have a look at this spreadsheet if I email it? A) to confirm my formulas/calculations are correct & B) to try & help me understand the effects the different ratios/combinations will have on acceleration.

I'd like the engine to be turning less revs at 80mph than it is currently but I'm also looking to improve the acceleration through the gears - I guess I'm wanting the best of both worlds really.

Thanks

Mike.

 

Mike,

Check your private messages. I have an Excel spreadsheet you will want to see and play with.

 

Here are a couple of T5 sites I found helpful.

COOL CATS » Celebrating the 1983-88 Mercury Cougar » Modifying : Ford Borg-Warner T-5 Manual Transmission Data

TTC: TREMEC Transmissions

 

the best way to go is going to be the bell from www.5speeds.com and a ford t5 from a 5.0 or a cobra which are about 1000 rebuilt which is what i am running, and i spinn the 275s without any problem and the trans is still there

 

Is that the V12 multi-pattern bellhousing from 5Speeds.com?

 

Multi Pattern does not mean it works on the 6.0L block though...

It has bolt and locating pin holes for early and later 5.3's only.

The 6 liter is a different animal.

Dave

 

I got a hold of Robert from thedrivenman.com, in regards to their 5-speed kit to my 5.3l. All seems fine, but guy just disappeared for a week and not responding. Not sure what to expect if I place that order, any advice?

 

I bought a street aluminum flywheel from him a few years back on his ebay store and the transaction went well. I have heard some people say they have had issues with the delivery of trans kits from him, but that may be more of a keisler issue.

 

Prepaid 50% today, invoice finally showed up in my paypal account. Now few short weeks and kit should be here.

 

Good luck with your project.

 

Jagzilla,can you reveal some of the details of what you used to get that trans behind the 12? I'm trying to get some kind of 6 spd behind a 6.0L. The new t56 can be had with 2.97 1st and the two top gears can be easily changed out for .80 and .68. The main concern for me is the shifter on the R.O.D being so bulky. How did it work out for you?

 

I'll do better than that. Here is an article by a guy I know, who documented what he did when he put a ROD in his XJS: Richmond Transmission

 

I got my Tremec to function fairly well. I am actually enjoying the feel and power of 5 speed next to V12.

 

ive yet too see or hear anything about the m22 munchie... it has too be possible

 

Hi Sean,

Intriguing thread. Might just be my project now..... still not finished ;-)
Can you come back to me on this one? Any info is welcome!

 

That's going to be tough, since you responded to a thread from 2013...

 

Fortunately veteran member Sean B is still alive and kicking, at least half hour ago ;-)