4200 changing back boxes

Delmonte

Member
Messages
878
As my indy is closed, thought I might have a go at putting on some custom SS back boxes I bought off ebay.
No idea how to do it but people have mentioned it's an easy DIY job.

First thing is, I have nowhere near enough space to get under it, so would need to purchase ramps. These likely to give me enough clearance?

Next, do I need to remove the bumper or rear valance?

Most importantly, do I need to use heat or do any type of welding - if I do, I'll forget the idea.

If the job is doable for a very amateur type at home, I'll have a crack at it (if it's not likely to leave me with an undrivable car when I give up halfway through)
Any guidance appreciated
 

tulit

Member
Messages
110
You may be able to do it without a ramp. Possibly if you have a jack would be sufficient to fit the muffler under the car.

You need to remove the rear under guard. Removing the bumper shell itself isnt necessary.

I will say also removing the rear wheel liners would make the whole job MuCH easier too.

I did in on my car with a lift and only removing the rear under guard. Having the liners out would have made it infinitely easier.


Sent from my iPhone using Tapatalk
 

2b1ask1

Special case
Messages
20,220
First tip is to mask well the openings in the bumper around the tail pies before you start to prevent scratching them as there is not a great deal of room given the wiggling needed.

personally I find it easier to drop the spreader bar in the middle under the gearbox then take the long pipes off the front end of the rears, be prepared to take them off. Then as others have said taking the rear arch liners out makes life a little easier. Then unbolt the hangers from the boxes as that is easier than fighting the hanger straps.

good luck and go for it but DO make sure your vehicle is PROPERLY supported, we want you to update us!
 

TimR

Member
Messages
2,656
I found the job was a total pig when I did mine...
The rear undertray wasn’t coming off for love or money; not without drilling out all the fixings, bar one I think...It was destruction too far for me.
I seriously contemplated removing the rear bumper to get it done.
Rear arch liners is a must for access IMO. So too, the loosening and movement of the exhaust in front of boxes.
It might sound a tad dramatic but you can remove the floor of the spare wheel well with relative ease, which would give decent access if it becomes a challenge of doing a minimum of disassembly or damage to corroded fixings....
HTH
 

Delmonte

Member
Messages
878
Thanks guys. Alas, Tim you have confirmed what I suspected, that it’s a horrible job requiring patience, space and talent that I probably don’t have.... especially when something does not come out, or come off, or fit straight... I’ll think seriously before taking this on...
 

lozcb

Member
Messages
12,301
Thanks guys. Alas, Tim you have confirmed what I suspected, that it’s a horrible job requiring patience, space and talent that I probably don’t have.... especially when something does not come out, or come off, or fit straight... I’ll think seriously before taking this on...

If you have the slightest reservations , get the car to well respected exhaust centre and ask them to fit them , tape up the bumper openings before you let them work on it , On my first 4200 i did this with a set of Tubi's , they should do it for aroung £50-75 , they have all the right stuff and you wont be swearing and bruising your knuckles , Some even have glazed observation rooms so you can see the fitters working on the car simples