Hi all,

I have a 1971 4.2 Series 1 that has had a Toyota Supra gearbox grafted into it. It's a great car to drive. I am in the process if purchasing a series 3 which has a very nice interior and a recently reconditioned motor. Body work though has the usual rust problems.

Am I correct in assuming the fuel injected motor is a simple fit onto the Supra box and slip into the car? Is there anything I would need to be particularly mindful of.

Similarly I assume the seats are pretty much a straight swap; out of the series 3 into the series 1?

Lastly will the standard series 3 alloys go onto the series 1?

Thanks in anticipation

 

Alloys will fit!



Fuel injected engine will fit. Basis is the same. Bear in mind you will need some wiring and the ECU.

Consider about swapping the front brakes as well, major upgrade. Also, look into the diff ratios. You might be lucky to find a better ratio under your series 3, for faster take off or easier cruisin

 

Do you want to fit the engine only or the whole fuel injection system?
The first option would be easiest (carbs will probably need re-jetting or resetting)
The main difference in the series 3 engine is the larger valves and the slotted bores, both improve it.

 

I've been seriously considering that transmission swap in my Series 1. How does that thing drive? Pretty good acceleration and such?

 

I just put S3 seats, seat belts front and rear into my old '72 Series 1. Front seat belts into the "B" pillars. Rear seat belts are a bolt in add on.


I also added the S3 front arm rests/door pockets.. easy add on that really make a big difference.. only had to make one short bracket to bolt on the
front of the arm. Note the tweeters in the front doors - also in the dash pad... new sound system really sounds nice with all new speakers and amp
in the trunk. All new upholstery (except the seats) and new headliner.. car has a powered sun roof as well. You can see the front seat belts in the
"B" pillar that is just S3 stuff.


Dual AC/heater vents in the parcel tray surround with veneer that matches the new dash wood.


See the photos below.

 

Thanks for the response. I was considering the upgrading the whole shooting match; motor and fuel injection system. I am aware I will need to computer and some wiring but I am hoping for better economy and smoother running than the old twin carbs.

 

Sorry. The Supra box makes the car. I love it. It was originally a 3 speed auto so we put in the manual pedal box and gearbox. Put a short shift kit into it as well so we didn't have to do anything to the auto consol. The short shift kit makes changes a bit notchy but it really goes. Can;t get the smile off my face any time I drive it.

 

I was looking at the same idea for my XJC to be better mileage etc, but then considered how many miles I'd do per year, decrease of value because of obvious non-originality, extra hassle with looking after the EFI system, and it didn't make sense to me for my situation.

Rather put better carbs (ideal/ dream would be triple webers, a series 3 head (ported, might be worth doing whilst the engine is out of the car), Decent electronic ignition (123-ignition appeals at the moment) and maybe some decent headers.

Like to get the Supra gearbox conversion though, or even a jaguar series 2 or 3 box.

Still that's a long way off.

 

I was pretty sure I wanted to go for it, but now I think I will for sure. Aside from transmission cost, how mush did it cost (or what all did you need to buy) to replace it with a supra one?

 

This bellhousing will give you a few options.
You may be able to use a 5-speed out of a wrecked Chevy.
This is for the V-12 engine, only.
My coupe has a 1971 Jaguar XJ6 4 door short body 4-speed with overdrive.
Everything bolts right up, with no mods. Even the driveshaft fits, perfectly.
I sourced an NOS pedal housing and a clutch master cylinder for a Jaguar Mark II.
Pedals and rubber covers can be bought, new.
V12 Jaguar Bell Housing

 

Just found this British vender that has a good trans conversion.

Home

 

It was a while ago now but from memory around $1500 (Aus) for the box $2000(ish) for the conversion kit and $500 (ish) for other bits and pieces. Out here it's probably the cheapest conversion you can do and makes so much difference to the car .... .

 

Thanks Giovanni,

I knew about them before, they are on the list of alternatives.