What should I do with my diff?

[goldscode]

At least you can boast that you've got a big Woody under your hood !!

[xpconnor]

At least you can boast that you've got a big Woody under your hood !!

I will have when it arrives.

OK, so I am sold on engine and diff combo, does anyone have any opinions on transmission. Happy to get a standard reco as it will help keep costs down a bit but are there any good arguments for an upgrade other then it will shift a bit harder which is probably not what I am looking for in this car. Also is there a difference between C4's I thought I read that some had a different valve body that was more of a winter setup for cars in the colder states and the car would take off in second gear, but then I also thought that you could just control that buy which D position you place the transmission in.

[boofhead]

Tough to say - I would not spend a lot though a kit to help improve the box might be worth the investment since your rebuilding any way and your engine will still have well above stock power and torque.

As far as the year - indeed the very very early C4s did start in second gear then down shifted if needed. I would assume most people would have changed out the body for those gearboxes by now.

Do you have a C4? I have one to sell if your interested.

[xpconnor]

Yep I've got one thanks Boof, pulled it out of the car as I was stripping it down. Don't really have any idea what condition it is in but judging by the condition of the engine when I pulled it apart I will just assume it is cooked. Hopefully having it recoed now will mean I will only have to refit it to the car once.

In regards to the valve body is there an easy weigh to tell what's in the box before it is stripped.

[Shaunp]

Yes mate you really want a 67 on box/valve body so you get 1,2 & drive, Ford called this select shift, earlier one, pre 67 were a crusimatic. they have 1 and then to drive positions one that takes off in 1st and an other that takes of in 2nd and skips first. Borg warner model 8 & 12 which Jag used in the 60's were the same. The story is they take off better in slush and snow better in 2nd. That said you want a basic rebuild with a mild shift kit and a good convertor.

[xpconnor]

So even with the cruiseomatic if you select the correct D position with the shifter you still take off in first?

[nassi]

So even with the cruiseomatic if you select the correct D position with the shifter you still take off in first?

Thats correct, I still you mine and see no reason to change it. The only problem with them is that you cannot hold it in second gear and this would be nice on a couple of circuits I know.

[hybrid]

If you're half mechanical, have a go at building the box yourself using one of the bad shoe productions videos.

Especially if you're just going to put all new clutches and bands in it.

[Shaunp]

Give these blokes a call I've stuff from them in the past they may have a 1, 2,Drive type valve body. I seem to member some early mustang C4 have different numbers of splines as well.

http://www.transwreck.com/

[xpconnor]

If you're half mechanical, have a go at building the box yourself using one of the bad shoe productions videos.

Especially if you're just going to put all new clutches and bands in it.

I did read some good recommendations about those videos and the little clips on YouTube look really good. I think I will have a go at the diff myself using the rebuild vids off YouTube I posted earlier in the thread and if that seems to go smoothly I'll purchase the bad shoe transmission vid and a reco kit and have a got at the transmission. Things will happen slowly on those two fronts for the time being as I have my money tied up with the engine build but I will just keep an eye on parts and keep reading so hopefully it all goes smoothly.

Nassi and Shaun if they still take off in first when the correct D is selected I think that will be fine, then if someone else is driving the car I can just tell them that the D that takes off in second is the correct one and stop them wearing out the rear tyres so quickly.

[nassi]

LOL.

[Shaunp]

Yeah but what if you want to shift it manually 1st-2nd drive ? I'd swap it for sure. C4's are easy to get, I've given them away for a 30 pack of beer.

[nassi]

Yeah but what if you want to shift it manually 1st-2nd drive ? I'd swap it for sure. C4's are easy to get, I've given them away for a 30 pack of beer.

You can shift manually 1st-2nd, drive will happen when its ready. You can also downshift manually. You just cant hold 2nd.

[xpconnor]

Yeah but what if you want to shift it manually 1st-2nd drive ? I'd swap it for sure. C4's are easy to get, I've given them away for a 30 pack of beer.

You can shift manually 1st-2nd, drive will happen when its ready. You can also downshift manually. You just cant hold 2nd.

To me an auto is set and forget. If you want to change gears you get a manual. Anyway not even sure what valve body my transmission has yet so I will just build it, drive it and if I don't like it I will look at swapping it over. I had always liked the idea of a gear vendors for the over drive function but they are too expensive and I don't think I will need it when this should cruise at under 2000rpm.

[Shaunp]

There was a bloke on the north side of Brisbane who had F100 parts he used to have 2nd over drives from the US. Not sure what brand, I understand they were like a Laycock ie like Jags and MGs etc had. I suspect they would have been made by BorgWarner.