GM TH 400 Auto box - Series 3 Etype

Talk about the E-Type Series 3

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paustin
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Joined: Tue Aug 21, 2012 4:48 pm

#1 GM TH 400 Auto box - Series 3 Etype

Post by paustin » Tue Jan 09, 2018 5:02 pm

Thinking of converting my BW12 Auto equipped series 3 to 4 speed GM 400. Anyone with experience? Is it a worthwhile mod from a driving point of view?

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64etype
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United States of America

#2 Re: GM TH 400 Auto box - Series 3 Etype

Post by 64etype » Wed Jan 10, 2018 7:00 pm

Can't comment on the improvements, but John's Cars in Dallas, Texas uses the 700R4 transmission for his XJ conversion kits. His notes on the E page say he's considering a kit for the V12. Definitely a source for some of the required parts like the adapter plate.

http://www.brokenkitty.com/qb/v12qb.htm
Eric

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Jagboi
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#3 Re: GM TH 400 Auto box - Series 3 Etype

Post by Jagboi » Wed Feb 21, 2018 6:38 am

Note that the GM400 is a 3 speed, not 4. The 4L60 and 4L80 are 4 speeds. The 4L80E is what Jaguar used for the 6.0 V12 cars, but it has a different bolt pattern than a 5.3 HE block, which I believe is also different from a 5.3 pre HE block.

The 4L80E is a big transmission, I doubt it would fit in an E Type. It's also a lot more than you need, it was used by GM in 3/4 and 1 ton trucks and motorhome chassis up to 20,000 lbs.

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Geoff Green
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#4 Re: GM TH 400 Auto box - Series 3 Etype

Post by Geoff Green » Wed Feb 21, 2018 12:45 pm

The Daimler limo used the Turbo Hydramatic behind the 4.2 inline 6 with an adapter plate. Great transmission with the variants used with the V12 XJS and sedans until the last V12, XJR 306 supercharged 6.
Last edited by Geoff Green on Thu Feb 22, 2018 1:30 pm, edited 1 time in total.

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Kember17
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#5 Re: GM TH 400 Auto box - Series 3 Etype

Post by Kember17 » Wed Feb 21, 2018 4:50 pm

Jagboi wrote:
Wed Feb 21, 2018 6:38 am
Note that the GM400 is a 3 speed, not 4. The 4L60 and 4L80 are 4 speeds. The 4L80E is what Jaguar used for the 6.0 V12 cars, but it has a different bolt pattern than a 5.3 HE block, which I believe is also different from a 5.3 pre HE block.

The 4L80E is a big transmission, I doubt it would fit in an E Type. It's also a lot more than you need, it was used by GM in 3/4 and 1 ton trucks and motorhome chassis up to 20,000 lbs.
The 4L80E is what I have in my X306 XJR6 with the AJ16 4 litre supercharged engine.

Peter
Peter

1966 LHD US Import Series 1 2+2 (undergoing full restoration)

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Woolfi
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#6 Re: GM TH 400 Auto box - Series 3 Etype

Post by Woolfi » Sat Mar 17, 2018 9:54 pm

The wight of the 4L80 automatik gearbox from the 6,0 L motor is 120 kg ! ! !
Regards Wolfgang Gatza

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jagwit
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#7 Re: GM TH 400 Auto box - Series 3 Etype

Post by jagwit » Tue Jun 12, 2018 8:08 pm

I installed a GM 4L60e behind the 7.2L V8 in my Jensen Interceptor (which has since been upgraded to high compression pistons). I did have an upgrade kit fitted to it purchased from Monster Transmissions.

The "non-ecu" standard 4L60 would be a perfect choice for the S3 V12 and I have also wondered if it would fit. Just imagine doing 2000rpm at 120km/h (75mph)....
Best Regards
Philip
71 E-type V12 Coupe,
80 XJS (EFI by Megasquirt & EDIS-6 + 5sp manual overdrive)
73 Jensen Interceptor
74 Interceptor (EFI by Megasquirt + overdrive 4sp auto)

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