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Old 10-28-2004, 23:59   #1 (permalink)
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Tunnel Work and diff ratios?

G'Day Everyone,
Soon, i will most probably be changing my TC's auto for a 4 speed manual (borg warner) unit from a TF cortina, and i have two enquiries about the job.
-Does anyone know if the tunnel needs to be modified to house the 4 speed?
-Is the diff ratio for the automatic different to that of the 4 speed manual?
Any help will be greatly appreciated.
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Old 10-29-2004, 00:11   #2 (permalink)
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Re: Tunnel Work and diff ratios?

The tunnel should fit the 4 speed no drama, i think the main issue with cortinas was going from manual to auto (i belive manual tunnel was smaller).

Diff ratio doesnt really matter, manuals had higher ratios, 3.2 or so, I will guess you have 3.7 or 3.9 diff with the manual you are going to have fun, but speedo will be out.
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Old 10-29-2004, 00:16   #3 (permalink)
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Re: Tunnel Work and diff ratios?

Thanks for your help! Do you know if a TF cortina diff and axle bolts straight into the TC?
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Old 10-29-2004, 00:19   #4 (permalink)
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Re: Tunnel Work and diff ratios?

given the big change in body shape bewteen tc/td and the TF cortina, i would be betting on 'NO" myself, but I honestly can't say.
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Old 10-29-2004, 07:26   #5 (permalink)
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Re: Tunnel Work and diff ratios?

Quote:
Originally Posted by EddyCortinaMan
Thanks for your help! Do you know if a TF cortina diff and axle bolts straight into the TC?
TF diff won't fit straight in to a TC they have different shock mounts
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Old 10-30-2004, 07:07   #6 (permalink)
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Re: Tunnel Work and diff ratios?

Quote:
Originally Posted by BLKEBXR8
TF diff won't fit straight in to a TC they have different shock mounts
is that the only difference?
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Old 10-30-2004, 21:03   #7 (permalink)
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Re: Tunnel Work and diff ratios?

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Originally Posted by TaraHymen
is that the only difference?
Fairly sure have put 9 inch made for TC into TF before everything bolted up except for shocks ( & of course the tailshaft but that won't matter to you )
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Old 10-31-2004, 01:18   #8 (permalink)
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Re: Tunnel Work and diff ratios?

how did u get around that? use the earlier shocks?
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Old 10-31-2004, 02:08   #9 (permalink)
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Re: Tunnel Work and diff ratios?

Quote:
Originally Posted by TaraHymen
how did u get around that? use the earlier shocks?
We cut the brackets off the TF diff & welded them onto the TC diff in your case bieng opposite way you'll have to cut the TF brackets off then drill a hole for the bottom shock mount bolt . You'll need some tube that slides over the bolt to put in between the two plates where you drill so it doesn't crush once tightened . Just have a look at your diff & you'll see.
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