I was thinking about doing a sbc swap on my SIII. 350/350 turbo trans. Do I need to get a short tail or long tail trans. or does it even matter?

 

That combination would not be allowed in a lot of states.. too old. CA checks cars back to 1974 every other year... could not put that old of engine in a SIII.

Plus why would you want to?

Best choice today is LS series engine with fuel injection and a OD transmission.

 

Well see where I live no ones concerned with how old it is, that's just silly. Also I really don't care what the "best choice" is because it will be changed several times. The 350 is only the beginning, I'll move to my 383 and 700r4 and then probably an R35 and 6 speed if I feel like it. But right now I just want to get her dependable and with a turbo 350 I can use the existing gear selector. Quick and easy.

 

If you use the short shaft T350 a 200R4 will bolt in later if you decide to go od and it will allow you to shorted the shaft if decide to go something else later on.

Randy

 

Thank You Randy. That was everything I needed to know.

 

DC 73:
Well, other than USA, we had no idea of where you are and the SMOG rules silly or not. they are what they are.


Your response to Roger was a tad unfriendly, and he is a friendly guy!


So, good luck on wherever you wander....


Carl

 

The shifter is fine, the shift indicator is the problem for some cars... not marked
for a fourth gear. It will work but just not indicate the selected gear exactly properly.

"Quick and easy"? Not with your lack of understanding about even the Jaguar shifter capabilities...

 

The turbo 350 doesn't have a 4th gear. So tell me again where I don't understand.

And I wasn't meaning to be unfriendly, it's just that I asked if the trans. should be short or long and the immediate response is "Why would you want to do that"? and that seemed like unfriendly criticism to me.

 

I had a TPI 350/TH350 swapped into an '86 XJ6 and at least in Arizona she passed emissions just fine. Not sure if which trans was in it though. Absolutely fun car.

 

PRND2L


The Jag XJ6 Shifter may or may not reach L.


I solved mine by installing an XJS shift tower. As that XJs used a GM trans, TH400, it's detents worked on my 4L60E.


And, whether one cares or not, an older engine transplant may be good in one's state, but not in another. thusly, sales or even a move are an issue.


IMHO, SMOG rules are silly. The objective is worthy, the execution, poor.
a simple sniff test would do just fine. Run clean however you do it....


SMOG rant over....


Carl

 

Originally I found a shift linkage kit for the TH350 that would allow you to use the factory shifter. But I can't seem to find it now.

As far as the SMOG thing goes I didn't realize my location only said USA. But I just recently moved to KS and they don't have inspections. But I am trying to keep up to Missouri's standards for the resale and moving aspect of it all. Their laws will allow me to do the 350/TH350.

But the further I get into doing this I get more and more worried that the rear diff. gear is a little too "highway" and that the car won't be too great at the launch. Is there somewhere I can get a lower gear or does the 2.88 do just fine?

 

You can change the Jaguar rear end gears easily enough - go to 3:31 or even higher numerically - but you will increase the RPM's on the highway with the 350 trans to a very high number since it is 1:1... or use a 700R with the very low first gear (OD) and it will pull initially fine to move the heavy car or install a 350 engine with enough low end torque - or some combination of all of the above. It is all about planning your goal and then putting things in to achieve the goal..

My '71 XJ pulls the 2:88's just fine, but I have 474 pounds of torque starting at low engine RPM's. When I built the brand new engine, low RPM performance was the goal. Being able to cruise at 1750 rpm at 65-75 MPH in OD and still be able to pass quickly but still be able to burn 87 octane gasoline without knocking.

When the engine was built in '95 (installed in '97 due to work and other projects) it was state of the art... today it is not. Could achieve all the same performance for $$$$'s less with a modern LS engine and six speed auto trans. Now, I am going back and converting it to modern aftermarket fuel injection since I have a lot of money in the current setup.

I had a '74 Jag with a 350/350 with the stock shifter and had no problems.. changed it to a very mild 383/700R and used the same Jaguar shifter. It had 3:31 gears and performed very well but the body rusted away.