Four lug to five lug - Vintage Mustang Forums
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post #1 of 11 (permalink) Old 06-16-2019, 12:28 PM Thread Starter
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Four lug to five lug

Hey, Im wanting to do a four lug conversion to a five lug and I was wondering if it was better to use an adaptor or replace the axle shaft to one design for a five lug already?
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post #2 of 11 (permalink) Old 06-16-2019, 12:54 PM
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You'll need to change the entire rear axle assembly as the 5 lug axle shafts won't fit in the 4 lug axle housing. The 5 lug housing has an 8" or more uncommon 9" ring gear and some do a conversion with the newer 8.8" rear axle assembly.

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post #3 of 11 (permalink) Old 06-16-2019, 12:55 PM
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To do the front, you'll need V8 spindles, bearings, tie rod ends, center link, Pitman and idle arms, possibly new upper and lower control arms.

'66 Tahoe Turquoise/ Aqua coupe
•289 / 4100 •C4 Auto •Disc Brakes
•Dual Exhaust •16:1 Manual Steering
•Rally Pac •Console •Deluxe Belts
•LOTS of Rotunda accessories
•Original Styled Steel Wheels
...my first car

'66 Emberglo / Parchment coupe
•289 / 2100 •C4 Auto •Disc Brakes
•Dual Exhaust •16:1 Power Steering
•Dealer Air Conditioning •Console
...son's first car


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post #4 of 11 (permalink) Old 06-16-2019, 01:02 PM
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It will cost more doing it the "right"way which is converting all the suspension,steering,brakes to V8 specs but will open up a lot of possibilities and be safer in the long run
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post #5 of 11 (permalink) Old 06-16-2019, 01:37 PM
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Go the easy way and get some adapters to be able to fit those donk 'teens with bands. The world needs more Darwin participants.

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post #6 of 11 (permalink) Old 06-16-2019, 04:25 PM
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The short answer is:

Do it right.

The V8 rear end assembly, with gears, will be about $500 +/- for a 1965 1966. You can use 1967 - 1970, cheaper, with later wheels and adapters, but it will still be $400 or so.

Front end, you have to replace pitman arm and everything outbound from it (all steering part, center link, tie rods, sleeves, spindles, etc.) You do not have to change upper or lower control arms.

You will need a V8 drive shaft. There are little parts, like wiring, etc. that has to be changed out also.

It is not a hard conversion, just tedious and expensive, unless you have a donor car sitting right beside you.

Do not put a V8 type engine on 4 lug front spindles. I see too many of those spindles shearing off the right side pin. I do not know why the right side, maybe 50 years of curbs and potholes, or something else. Also, typically with V8 brings higher speeds, and the little drums on a 4 lug can't handle it, so the entire car becomes a parts car.

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post #7 of 11 (permalink) Old 06-20-2019, 09:38 AM
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Great information. . .
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post #8 of 11 (permalink) Old 06-20-2019, 09:50 AM
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Yeah, Had a guy in my club use the 4 lug to 5-lug adapters...and it came out really well... The only thing that I did not like about the adapters was that I think that they ONLY USE 3 LUGS to hold on the 5 Lug ADAPTER! LOL! The 4th lug can't be fitted I don't think because it does not have enough space to fit on the 5-lug adapter ring! No LIE! He got his 5-lug wheels though...even if they are only held on by 3 lugs....crazy! The adapters sell for around $80 a piece... SO Why make them? ..because they only use 3 lugs.... Because People buy them... Didn't old French Peugeots and Yugoslavian YUGOS only use 3 lugs?!?? to hold the wheel on?

)

Tony K.



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post #9 of 11 (permalink) Old 06-20-2019, 11:59 AM
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One alternative is to do the front suspension as mentioned above, and then RE-DRILL the rear axles/drum for 5 lug until you can get the money for a new axle. I did that on my build and getting the rear axle/Drum done by a machine shop was like $200.
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post #10 of 11 (permalink) Old 06-20-2019, 04:29 PM
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Quote:
Originally Posted by NEFaurora View Post
Yeah, Had a guy in my club use the 4 lug to 5-lug adapters...and it came out really well... The only thing that I did not like about the adapters was that I think that they ONLY USE 3 LUGS to hold on the 5 Lug ADAPTER! LOL! The 4th lug can't be fitted I don't think because it does not have enough space to fit on the 5-lug adapter ring! No LIE! He got his 5-lug wheels though...even if they are only held on by 3 lugs....crazy! The adapters sell for around $80 a piece... SO Why make them? ..because they only use 3 lugs.... Because People buy them... Didn't old French Peugeots and Yugoslavian YUGOS only use 3 lugs?!?? to hold the wheel on?

)

Tony K.
yugos use 4lug. older small renault and peugeot use 3lug..

don't drive faster than your guardian angel can fly !!
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post #11 of 11 (permalink) Old 06-21-2019, 03:33 PM
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Well, I was close...lol...

)

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1966 Mustang Sprint 200 Registry Owner/Moderator
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