b4 to b4.1
 

hi guys help me out.In the long run is it worth upgrading my b4 to a 4.1 ?
If so what parts would i need and a rough cost would be good .Many thanks Rob.

Is there an upgrade kit you can buy or do you need to buy all the spares separately?

Swifty

Correct me if I'm wrong but as far as I no neatly every part is different as they used a different plastic for the parts

The plastics are different but the parts numbers are generally the same - so if you buy spares for an old B4 you're probably going to end up with the newer plastics anyway.

In answer to the original question, my personal opinion is that there is no need to upgrade a B4 to a B4.1. There are only a couple different setup possibilities on the rear suspension, but I don't think the B4 setup is wrong. The new transmission will work the same as the old one unless you want to run a gear diff. Arguably the older US-made B4s are better quality anyway.

B4 TO B4.1
 

THANKS GUYS WIIL KEEP IT AS IT IS THEN

The V2 shocks are better than the originals as is the slipper spring.
But if you're happy with your current ones I wouldn't be worried about changing.

One thing that is worth getting IMO is the new rear suspension blocks - you get 4 in a pack with different degrees of toe in.

Something to bear in mind when buying spares is that apparently the rear chassis T piece is moulded differently to take the new gearbox casing (changed to accomodate the slightly different sized diff outdrives and bearings)

My car is becoming more of a B4.05 now as I'm replacing parts as they wear/break!

There is a topic in this section somewhere that gives all the changes in more detail.

b4 to 4.1
 

thanks ive ordered the new shocks but all for now thanks for the tip

The rear T Piece is different, but it just has some groves in it, the old gearboxes still fit perfectly in them, they can just accommodate the new gear boxes now.

Thats good to know, thanks

What are the part no for the v2 shocks?

I believe they are -
Complete shocks:
7474 and 7478
The shock bodies to upgrade existing shocks:
7475 and 7479

b4to4.1
 

Fitted new shocks today they are mint.Any other upgrades anyone could suggest.Cheers guys you have been a great help.

b4to4.1
 

got the shocks could you tell me a good starting point to set them for grass.Cheers.

try silver springs all round, 35wt in the front, and 30wt in the rear, and see how that goes

Thanks i wasn't sure what the right lengths were