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post #1 of 6 (permalink) Old 03-11-2016, 04:36 PM Thread Starter
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7.5 differential lock or 8.8 swap

What is the best budget aftermarket lock for 7.5 rear? Or is there an original lock in some Thunderbirds with 7.5?

Last edited by Finbird; 03-12-2016 at 04:54 AM. Reason: Title change.
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post #2 of 6 (permalink) Old 03-11-2016, 04:52 PM
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Quote:
Originally Posted by Finbird
Is there an original lock in some Thunderbirds with 7.5?
There is..Some MN12 came with a Trac-Lok in the 7.5 rear end from the factory..

AFAIK..It was only 89-95 models though..

Most people are going to tell you that you're better off upgrading to the 8.8 rear end..
Than to mess around with trying to install a 7.5 Trac-Lok into an originally "open" 7.5 rear end..

That's entirely up to you though, and if you plan on staying around stock power levels..You might as well stick with the 7.5 rear end..





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post #3 of 6 (permalink) Old 03-12-2016, 04:52 AM Thread Starter
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That's entirely up to you though, and if you plan on staying around stock power levels..You might as well stick with the 7.5 rear end..
So the 7.5 wont stay together with about 200hp? Im planning on starting practising drifting with the bird in the summer (on ice its easy with the stock 140 and one wheel drive ). Do i need different drive shafts for the 8.8 swap?
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post #4 of 6 (permalink) Old 03-12-2016, 05:15 AM
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Originally Posted by Finbird View Post
So the 7.5 wont stay together with about 200hp? Im planning on starting practising drifting with the bird in the summer (on ice its easy with the stock 140 and one wheel drive ). Do i need different drive shafts for the 8.8 swap?
Yeah, In fact you would even be fine at 300hp to the wheels with the 7.5 rear end..It's stronger than people give it credit for..

As long as you keep the AOD..You could swap to an 8.8 rear end, and use your stock driveshaft..






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post #5 of 6 (permalink) Old 03-12-2016, 08:38 AM
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The 8.8 is a direct bolt-in swap, no need to change the driveshaft, axles, or anything other than the diff itself. Considering how cheap a TL 8.8 is, there is really no reason to stay with the 7.5, unless you happen to come across a TL 7.5 unit for free.

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post #6 of 6 (permalink) Old 03-12-2016, 10:55 AM
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I believe the OP is in Finland, so as easy as it is for us to find the 8.8 rear ends used here..Probably not so easy to find there..







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