Diff case 742 68 Newport

[mrzods13]

Can you interchange a 742 case with a 489 case. Want to switch to sure grip and possibly 3.23 or 3.55 not sure which but looking to buy a whole pumpkin ready to go.

 

[Big_John]

Everything will interchange, but the driveshaft flange width may be different. They have adapter U-Joints if this happens.

 

[mrzods13]

Excellent thanks appreciate it.

 

[F Preston]

A 2070742 case uses a large pinion shaft - a 2881489 case uses a tapered pinion shaft.

I may be wrong, but I do not think they are interchangeable.

 

[Big_John]

A 2070742 case uses a large pinion shaft - a 2881489 case uses a tapered pinion shaft.

I may be wrong, but I do not think they are interchangeable.

He is changing the entire pumpkin. The pinions won't interchange, but that's not what he is doing.

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[F Preston]

Got ya.

 

[70bigblockdodge]

What gears are in your 742 case want to sell it.

 

[mrzods13]

I think they are 2.76, I need to find a a replacement then maybe I will sell.

 

[68Bigred]

I was thinking of doing the same. Why is the 742 so much more expensive and less avaiable? I also want to put some lower gears. My 742 I think is 2.7s with nly 52k miles on them.

 

[F Preston]

I was thinking of doing the same. Why is the 742 so much more expensive and less avaiable? I also want to put some lower gears. My 742 I think is 2.7s with nly 52k miles on them.

Who knows? I probably have a hundred of them.

 

[68plymouth383]

Yeah but you could buy 2 or 3 good ones for 1 of yours..............

Who knows? I probably have a hundred of them.

 

[68plymouth383]

The 742 is the most desirable case. The gears are very easy to find........ There everywhere.

I was thinking of doing the same. Why is the 742 so much more expensive and less avaiable? I also want to put some lower gears. My 742 I think is 2.7s with nly 52k miles on them.

 

[F Preston]

Yeah but you could buy 2 or 3 good ones for 1 of yours..............

Not really - most of mine are still sitting in cars, and I've never had to replace a case anyway.

 

[68Bigred]

I think I am just going to buy a complete done 742 with 3.23s since the 742 came in it. I have a 645ci trying to sell (title in hand) so that will free up funds for th 300