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Do I need axle upgrades if im running 250+hp?

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Dsavoie47 Daniel Savoie
Granite falls, Waahington, USA   USA
1964 Triumph TR4 "Jennifer"
Im doing an engine swap in my 64 TR4 solid RA. Is there any upgrades I need to do to handle the extra power? Or any axles that are easy swaps that can?

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JimG Avatar
JimG Jim G
Aurora, CO, USA   USA
Yes, you will need an upgrade, especially with the wider tires I assume your going to put on it.. A ford 8" is a good swap. I have a buddy that races with an 8" LSD.
jim g

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Dsavoie47 Daniel Savoie
Granite falls, Waahington, USA   USA
1964 Triumph TR4 "Jennifer"
Does that need to be modified to match stock width? Im trying to keep the body and appearance as stock as I can. Is the 8" a lot heavier?

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JimG Avatar
JimG Jim G
Aurora, CO, USA   USA
I Don't know about weights, I would guess it's heavier than the TR4 axle but it really needs to be. Plus you an get good LSD for a fraction of one made for the TR. I don't think it a lot heavier but some.
If you shop around you can find shortened axles and axle tubes for the 8". It's done all the time and there are plenty that do it.
Mark Williams Enterprises is a very popular one. Do some homework on shortening axles and axle swaps and I think you will see it's not that big of a deal.
Then you would need to weld on some new spring perches where they need to be. You buy perches ready to weld as well.

Here's an article on a Ford 9" & 4-link on a TR6. https://bowtie6.com/tr6-differential-and-rear-suspension/
Here's a video on a Ford axle in a TR4
Here is an article about a TR4 with a Ford 302 in it. He says he pulled a 13 sec 1/4 mile with the stock tr4 axle. I'll bet he doesn't do that too many times. http://www.britishv8.org/triumph/jaysmith.htm

jim g

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Dsavoie47 Daniel Savoie
Granite falls, Waahington, USA   USA
1964 Triumph TR4 "Jennifer"
Oh man thanks. This is just what i was looking for

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Bill Morris Avatar
Nor Cal, USA   USA
1971 MG MGB
Daniel,

Dont even think of running the stock axles. Those puppies twist with about half the power you are gonna put thru them. Losing a wheel/axle shaft at speed can be very exciting! But not recommended.

Check the web for the "Southwick" mod. Much stronger setup and not stupid money.

Good luck
Bill

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Dsavoie47 Daniel Savoie
Granite falls, Waahington, USA   USA
1964 Triumph TR4 "Jennifer"
Thanks Bill. I will look into other options.

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oldbagpipe Avatar
oldbagpipe Alec Buchan
Bellingham, WA, USA   USA
1962 Triumph TR4 "Blue Caboose"
1966 Triumph TR4A
1967 Triumph TR4A
1968 Triumph TR250 "The 'Project"
Tony Garmey @ Horizon Racing in Puyallup now does the Southwick conversion. Back when I did mine, the shipping to and from the mid west killed me!
http://www.horizonracing.com/

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Dsavoie47 Daniel Savoie
Granite falls, Waahington, USA   USA
1964 Triumph TR4 "Jennifer"
Thanks alec. That is a huge help

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oldbagpipe Avatar
oldbagpipe Alec Buchan
Bellingham, WA, USA   USA
1962 Triumph TR4 "Blue Caboose"
1966 Triumph TR4A
1967 Triumph TR4A
1968 Triumph TR250 "The 'Project"
I know Tony, talk to him at the track all the time. You can drop my name if you like, but he'll probably charge you double! smiling bouncing smiley

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oldbagpipe Avatar
oldbagpipe Alec Buchan
Bellingham, WA, USA   USA
1962 Triumph TR4 "Blue Caboose"
1966 Triumph TR4A
1967 Triumph TR4A
1968 Triumph TR250 "The 'Project"
I spoke with Tony last night at our year-end banquet. He said to give him a call, he'd love to help out. He said he even has another rear end with something along the lines of a Ford 9", which was built by Southwick, sitting in the corner of the shop which he'd love to get rid of..."cheap"...

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Dsavoie47 Daniel Savoie
Granite falls, Waahington, USA   USA
1964 Triumph TR4 "Jennifer"
Awesome. I'll give him a call today.

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oldbagpipe Avatar
oldbagpipe Alec Buchan
Bellingham, WA, USA   USA
1962 Triumph TR4 "Blue Caboose"
1966 Triumph TR4A
1967 Triumph TR4A
1968 Triumph TR250 "The 'Project"
You'll probably have better success tomorrow. Good luck.

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dherr2 Avatar
dherr2 David Herr
Adamstown, MD, USA   USA
1972 Triumph Spitfire MkIV "Rat Rod"
You also need to do a 4 link or something similar. I have a Rover in my TR4A solid axle and it axle wraps in first gear. I have tried all different types of traction bars, etc and have now given up and am putting in a Nissan R200 and the Triumph IRS rear with Good Part axles and CV axles. So if you are running 250+ you really need to take a look at changing the rear suspension to accommodate axle wrap as the stock leaf springs can't take the torque. I probably have 220 HP in mine and have driven the car starting in 2nd for 10 years trying to find a solution. I get it rolling and then punch it, still fast as hell, but looking forward to being able to drive with a properly planted rear diff.

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Dsavoie47 Daniel Savoie
Granite falls, Waahington, USA   USA
1964 Triumph TR4 "Jennifer"
You are running a rover v8?

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